Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 12
·5995-6003
·
IF 11.301
Shungang Liu,Wenyan Su,Xianshao Zou,Xiaoyan Du,Jiamin Cao,Nong Wang,Xingxing Shen,Xinjian Geng,Zilong Tang,Arkady Yartsev,Maojie Zhang,Wolfgang Gruber,Tobias Unruh,Ning Li,Donghong Yu,Christoph J. Brabec,Ergang Wang
Great attention has been paid to developing low bandgap non-fullerene acceptors (NFAs) for matching wide bandgap donor polymers to increase the photocurrent and therefore the power conversion efficiencies (PCEs) of NFA organic solar cells, while pyrene-core based acceptor–donor–acceptor (A–D–A) NFAs have been mainly reported via the 2,9-position connection due to their bisthieno[3′,2′-b']thienyl[a,h]pyrene fused via a five-membered ring bridge at the ortho-position of pyrene as the representative one named FPIC5, which has prohibited further narrowing their energy gap. Herein, an acceptor FPIC6 was exploited by creating the 1,8-position connection through fusing as bisthieno[3′,2′-b′]thienyl[f-g,m-n]pyrene linked at the bay-position via a six-membered bridge, with enhanced push–pull characteristics within such A–D–A structure. As a structural isomer of FPIC5, FPIC6 exhibited a much lower bandgap of 1.42 eV (1.63 eV for FPIC5). Therefore, the photocurrent and PCE of PTB7-Th:FPIC6 cells were improved to 21.50 mA cm−2 and 11.55%, respectively, due to the balanced mobilities, better photoluminescence quenching efficiency and optimized morphology, which are both ∼40% better than those of PTB7-Th:FPIC5 cells. Our results clearly proved that a pyrene fused core with 1,8-position connection with electron-withdrawing end groups instead of 2,9-position connection is an efficient molecular design strategy to narrow the optical bandgap and improve the photovoltaic performance of NFA based OSCs.
研究领域:
材料科学
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能源科学
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DOI
高影响因子
Journal of Materials Chemistry A
·
2019
·Vol. 8
·期 1
·69-76
·
IF 10.733
Xueshi Jiang,Lulu Sun,Wen Wang,Fei Qin,Cong Xie,Lin Hu,Yinhua Zhou
In this study, we report 10 cm2 nonfullerene solar cells with power conversion efficiency of 10.24%. The demonstration of the large-area cells is based on the HxMoO3-assisted growth of two silver electrodes, namely, the ultrathin-transparent electrode (on the top) and opaque electrode (at the bottom). The device structure has the configuration glass/HxMoO3/opaque Ag (70 nm)/active layer/HxMoO3/ultrathin Ag (8 nm)/MoO3. The chemically reactive HxMoO3 could react with silver oxide during the growth of the initial few nanometers of silver, as inferred from X-ray spectroscopy measurements. The reaction increases the nucleus sites that assist the continuous and uniform growth of the silver films. The percolation threshold thickness of conductive ultrathin Ag films on HxMoO3 can be as low as 4 nm. The root-mean-square surface roughness of opaque silver (70 nm) grown on the HxMoO3 surface is as low as 1.06 nm. HxMoO3 facilitates the growth of uniform, continuous and smooth silver films that enable the efficient large-area nonfullerene organic solar cells.
研究领域:
材料科学
·
光电化学
✓ 已验证
DOI
高影响因子
DYES AND PIGMENTS
·
2017
·
IF 3.473
Cuixia Yuan,Wenqing Liu,Minmin Shi,Shuixing Li,Yuzhou Wang,Huanle Chen,Chang-Zhi Li,Hongzheng Chen
In this paper, a non-fullerene electron acceptor , SF(DPPFB) 4 , which owns a spirobifluorene core and four diketopyrrolopyrrole (DPP) arms end capped by 4-fluorobenzene, is designed and synthesized for solution-processable organic solar cells (OSCs). SF(DPPFB) 4 shows similar absorption bands as those of its non-fluorinated parent compound, SF(DPPB) 4 . However, the terminal fluorine atoms reduce the energy levels of SF(DPPFB) 4 , especially, its lowest unoccupied molecular orbital level decreases by 0.04 eV than that of SF(DPPB) 4 , which enlarges the energy offset between the electron donor and acceptor, favorable for the dissociation of excitons in OSCs. Moreover, the fluorination improves the electron mobility of SF(DPPFB) 4 . Thus, the OSCs with poly(3-hexylthiophene) as the electron donor and SF(DPPFB) 4 as the electron acceptor can provide a maximum power conversion efficiency of 4.42%, with a lifted short-circuit current ( J sc ) of 8.48 mA cm −2 .
研究领域:
材料科学
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能源科学
✓ 已验证
DOI
高影响因子
Journal of Physical Chemistry C
·
2021
·
IF 4.126
Siyuan Weng,Man Zhao,Dayong Jiang
Compared with the electron donor of the bulk heterojunction (BHJ) organic/inorganic photodetectors (OPDs), there is less development in the field of electron acceptors that have strong absorption capacity in the visible light and near-infrared (NIR) region, which hinders the further research and development of OPDs. As a traditional acceptor, fullerene has limited electronic tunability and weak visible light absorption, which limits the optical absorption and electron tunability properties required by the donor. In this work, a novel low-band-gap nonfullerene acceptor (NFA) sodium indocyanine green (Ir-125) is introduced, blended with a fullerene derivative acceptor [6,6]-phenyl C61-butyric acid methyl ester (PC61BM) and a conjugate polymer donor poly(3-hexylthiophene) (P3HT), to form ternary BHJ-active layers, forming a high-performance BHJ OPD with ultrawide spectral response from the ultraviolet (200 nm) to visible light to NIR (1050 nm) region. Here, the high-performance OPD exhibits complementary absorption on the scale of exciton diffusion length and is uniformly mixed with the pure phases. The OPD has high external quantum efficiency (132%) and high detectivity (9.07 × 1012 Jones), which is much higher than those of P3HT:PC61BM, which are 58% and 3.62 × 1012 Jones, respectively, and also, OPDs show an increase in the photocurrent to dark current ratio (Iphoto/Idark) by one order of magnitude. The generation of the balanced photocurrent between the donor and NFA eliminates the undesirable limitation on the donor imposed by fullerene derivatives and expand the response range of the BHJ OPD, which opens up a new avenue toward a higher efficiency and wider response range for the OPDs.
研究领域:
材料科学
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光电技术
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有机电子学
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DOI
高影响因子
Journal of Materials Chemistry A
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2019
·Vol. 7
·期 7
·3307-3316
·
IF 10.733
Qisheng Tu,Changquan Tang,Qingdong Zheng
Wide-bandgap (WBG) polymers exhibit strong absorption bands in the short wavelength region, and they can offer complementary absorption when blended with their low-bandgap (LBG) counterparts in multi-junction, ternary-blend, or non-fullerene polymer solar cells (PSCs) thereby further enhancing power conversion efficiencies (PCEs) of organic solar cells. In this work, two WBG polymers (PSS2 and PSS3) based on ladder-type dithienocyclopentadibenzothiophene (DTCD) are designed and synthesized successfully. PSS2 and PSS3 possess relatively deep-lying highest occupied molecular orbital (HOMO) energy levels of −5.36 and −5.46 eV with optical bandgaps of 2.01 and 1.92 eV, respectively. In combination with a non-fullerene acceptor (EH-IDTBR), PSS2 exhibited a power conversion efficiency (PCE) of 9.46% with a short-circuit current (JSC) of 15.70 mA cm−2, a fill factor (FF) of 58.3% and a VOC of 1.033 V. The 9.46% PCE is the highest among all copolymers based on ladder-type multi-ring-fused aromatics. With EH-IDTBR, PSS3 showed an inferior PCE of 4.74% with an enlarged VOC of 1.138 V. Furthermore, the best-performing PSS2-based device showed excellent stability with a PCE of 9.03% after storage for 120 days, which is 95% of its original value. Our results indicate that the ladder-type DTCD is a promising building block for designing WBG semiconductors for photovoltaic applications.
研究领域:
材料科学
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有机光电子学
✓ 已验证
DOI
高影响因子
Journal of Physics-Materials
·
2022
·Vol. 6
·期 1
·014001
·
IF 5.847
Yang Cao,Jianjun Mei,Kai Xia,Ting Zhao,Jing Zhao,Nicola Gasparini,Vincenzo Pecunia
Ongoing developments in machine vision, wearables, and the Internet of Things have led to strong demand for easy-to-fabricate, color-selective photodetectors. Narrowband-absorption-type (NBA) printable organic photodetectors provide an attractive solution, given their spectral robustness and fabrication simplicity. However, a key remaining challenge to realizing their potential is to concurrently achieve high photoconversion efficiency and spectral selectivity. Herein, this challenge is tackled by investigating a non-fullerene-based route to green-selective, solution-based photodetectors. Soluble phthalocyanine acceptor PhO-Cl6BsubPc is considered due to its high absorption selectivity to green photons. Blends with soluble quinacridones are pursued to realize the ideal of a donor:acceptor layer selectively absorbing the target photons throughout its volume. A latent-pigment route to the solution-based deposition of linear trans-quinacridone (QA) enables well-intermixed QA:PhO-Cl6BsubPc layers. Green-selective photodetectors with cutting-edge performance are thus realized, achieving a 25% increase in external quantum efficiency compared to all prior solution-based NBA implementations, as well as a nearly five-fold enhancement of the green-to-blue spectral rejection ratio. The merit of this approach is further illustrated by comparison with the corresponding fullerene-based photodetectors. By demonstrating an approach to solution-based NBA photodetectors with cutting-edge photoconversion efficiency and spectral selectivity, this study represents an important step toward printable, high-performance organic color sensors and imagers.
研究领域:
材料科学
·
光电技术
✓ 已验证
产品关联
DOI
高影响因子
ORGANIC ELECTRONICS
·
2018
·
IF 3.68
Kang-Ning Zhang,Peng-Qing Bi,Zhen-Chuan Wen,Meng-Si Niu,Zhi-Hao Chen,Tong Wang,Lin Feng,Jun-Liang Yang,Xiao-Tao Hao
The crystallinity of non-fullerene acceptors as the third component has an important role on nanomorphology optimization and charge transfer dynamics of ternary organic solar cells (OSCs). Herein, efficient ternary OSCs were fabricated by incorporating two typical non-fullerene acceptors with different crystallinity , ( Z )-5-{[5-(15-{5-[( Z )-(3-Ethyl-4-oxo-2-thioxo-1,3-thiazolidin-5-ylidene)methyl]-8-thia-7.9-diazabicyclo [4.3.0] nona-1 (9),2,4,6-tetraen-2-yl}-9,9,18,18-tetrakis (2-ethylhexyl)-5.14-dithiapentacyclo [10.6.0.0 3,10 .0 4,8 .0 13,17 ]octadeca-1(12),2,4(8),6,10,13 (17),15-heptaen-6-yl)-8-thia-7.9-diazabicyclo [4.3.0]nona-1 (9),2,4,6-tetraen-2-yl]methylidene}-3-ethyl-2-thioxo-1,3-thiazolidin-4-one (EH-IDTBR) or (5Z, 5′Z)-5,5'-((7,7'-(4,4,9,9-tetraoctyl-4,9-dihydro-s-indaceno [1,2-b:5,6-b']dithiophene-2,7-diyl)bis (benzo [c][1,2,5]thiadiazole7,4diyl)) bis(methanylylidene))bis (3-ethyl-2-thioxothiazolidin-4-one) (O-IDTBR), into the host donor/acceptor active layers comprising of poly (3-hexythiophene-2,5-diyl) (P3HT) and [6,6]-phenyl-C71-butyric acid methylester (PC 71 BM). As a result, the 21.5% and 22.7% increase of the power conversion efficiency (PCE) for the two ternary systems were achieved, respectively, which was attributed to the enhanced light harvesting capability, optimized bulk-heterojunction morphology and the formation of cascade energy level alignments that could introduce an additional pathway for efficient charge transfer. Although both the short-circuit current density (Jsc) and fill factor (FF) values were increased significantly by regulating the weight ratios of non-fullerene acceptors of two ternary systems , the O-IDTBR-based ternary OSCs showed the higher Jsc while P3HT:EH-IDTBR:PC 71 BM system exhibited the higher FF values. The main difference of improved photovoltaic performance in the two ternary systems could be associated with the different blend morphology and charge carrier mobilities . In addition, nanomorphology studies suggested that lamellar stacking coherence lengths of P3HT in face-on orientation for EH-IDTBR- and O-IDTBR-based systems can be increased from 18.48 nm to 20.94 nm and 21.67 nm respectively, resulting from the stronger crystallinity of O-IDTBR than that of EH-IDTBR, which was beneficial for charge transport in the vertical direction. These results indicate that selecting the appropriate crystalline non-fullerene acceptors may be an effective strategy to optimize nanomorphology to further achieve high efficiency ternary OSCs.
研究领域:
材料科学
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能源科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMISTRY OF MATERIALS
·
2017
·
IF 9.466
Yunlong Ma,Meiqi Zhang,Yu Yan,Jingming Xin,Tao Wang,Wei Ma,Changquan Tang,Qingdong Zheng
Two novel small molecule acceptors (DTNIC6 and DTNIC8) based on a ladder-type dithienonaphthalene (DTN) building block with linear (hexyl) or branched (2-ethylhexyl) alkyl substituents are designed and synthesized. Both acceptors exhibit strong and broad absorption in the range from 500 to 720 nm as well as appropriate highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) levels. Replacing the linear hexyl chains with the branched 2-ethylhexyl chains has a large impact on the film morphology of photoactive layers. In the blend film based on DTNIC8 bearing the branched alkyl chains, morphology with well-defined phase separation was observed. This optimal phase morphology yields efficient exciton dissociation, reduced bimolecular recombination, and enhanced and balanced charge carrier mobilities. Benefited from these factors, organic solar cells (OSCs) based on PBDB-T:DTNIC8 deliver a highest power conversion efficiency (PCE) of 9.03% with a high fill factor (FF) of 72.84%. This unprecedented high FF of 72.84% is one of the highest FF values reported for nonfullerene OSCs. Our work not only affords a promising electron acceptor for nonfullerene solar cells but also provides a side-chain engineering strategy toward high performance OSCs.
研究领域:
材料科学
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能源科学
✓ 已验证
DOI
高影响因子
DYES AND PIGMENTS
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2017
·
IF 3.473
Lixin Wang,Haifen Liu,Zhaoxiang Huai,Yun Li,Shaopeng Yang
A series of D-A 1 -D-A 2 structured copolymers were synthesized by combining the simplest donor unit of thiophene (Th) and dual easily available acceptor units of alkoxylated benzoxadiazole (ROBO) and quinoxaline (ROQx). Short alkyl side chains were distributed over the dual acceptor units to dilute steric hindrance while guaranteeing solution processing of the polymers. The strong acceptor properties of benzoxadiazole (BO) could enhance the intramolecular charge transfer (ICT) interactions, while the weak acceptor of quinoxaline (Qx) may be used to strengthen π-π interactions through the favorable quinoidal structure form. Fixing Th and ROBO units, the effects of fluorination of the Qx unit were investigated. PSCs based on 3,9-bis(2-methylene-(3-(1,1-dicyanomethylene)-indanone))-5,5,11,11-tetrakis(4-hexylphenyl)-dithieno[2,3-d:2′,3′-d′]- s -indaceno[1,2-b:5,6-b′]dithiophene (ITIC) and PTBOQ-F exhibited a superior PCE of 5.84% due to the favorable hole mobility and blend morphology. In comparison, the separated D-A 1 and D-A 2 controls of PTBOQ-F afforded significantly lower PCEs (<1.45%). These results indicate that our approach is a feasible way to obtaining cost-effective polymers by screening the easily accessible moieties in a proper manner of dual acceptor units.
研究领域:
材料科学
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有机电子学
✓ 已验证
DOI
高影响因子
CHEMISTRY OF MATERIALS
·
2017
·
IF 9.466
Yunlong Ma,Meiqi Zhang,Yabing Tang,Wei Ma,Qingdong Zheng
The utilization of low bandgap copolymers has been considered as one of the most efficient ways to increase power conversion efficiencies (PCEs) of fullerene-based polymer solar cells (PSCs). However, an increase in the short-circuit current (JSC) value is usually counteracted by a decrease in the open-circuit voltage (VOC), which limits a further PCE enhancement of fullerene-based PSCs. As a result, nonfullerene acceptors with wide-range tunable energy levels are used as alternatives to the traditional fullerene acceptors to overcome the negative trade-off between the JSC and VOC. Here, a novel nonfullerene acceptor is developed by using an angular-shaped dithienonaphthalene flanked by electron-withdrawing 3-ethylrhodanine units via benzothiadiazole bridges. The obtained nonfullerene acceptor exhibits a high-lying lowest unoccupied molecular orbital level of −3.75 eV with enhanced absorption. In combination with a benchmark low bandgap copolymer (PTB7-Th), a high PCE of 9.51% with a large VOC of 1.08 V was achieved for the nonfullerene PSCs, demonstrating an extremely low energy loss of 0.50 eV, which is the lowest among all high-performance (PCE > 8%) polymer-based systems with similar optical bandgaps. The results demonstrate the bright future of our nonfullerene acceptor as an alternative to the fullerene derivatives for PSCs with large JSC and VOC values and improved device stability.
研究领域:
材料科学
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能源科学
✓ 已验证
DOI
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2024
·
IF 3.9
Xin Zhu,Lei Yang,Yangyang Pan,Yuqin Yang,Xuming Ding,Chuanming Wan,Zhuo Zhang,Yun Luo,Qinghai Zhou,Liwei Wang,Shengxiong Xiao
Graphical A conjugated molecular HBC-4-PDI with three-dimensional geometry is synthesized and applied as a non-fullerene acceptor material in the active layer of organic solar cells. Although fullerene derivatives such as [6,6]-phenyl-C 61 /C 71 -butyric acid methyl ester (PC 61 BM/PC 71 BM) have dominated the the photoactive acceptor materials in bulk heterojunction organic solar cells (OSCs) for decades, they have several drawbacks such as weak absorption, limited structural tunability, prone to aggregation, and high costs of production. Constructing non-fullerene small molecules with three-dimensional (3D) molecular geometry is one of the strategies to replace fullerenes in OSCs. In this study, a 3D molecule, contorted hexa- cata -hexabenzocoronene tetra perylenediimide (HBC-4-PDI), was designed and synthesized. HBC-4-PDI shows a wide and strong light absorption in the whole UV-vis region as well as suitable energy levels as an acceptor for OSCs. More importantly, the 3D construction effectively reduced the self-aggregation of c -HBC, leading to an appropriate scale phase separation of the blend film morphology in OSCs. A preliminary power conversion efficiency of 2.70 % with a champion open-circuit voltage of 1.06 V was obtained in OSCs with HBC-4-PDI as the acceptor, which was the highest among the previously reported OSCs based on c -HBC derivatives. The results indicated that HBC-4-PDI may serve as a good non-fullerene acceptor for OSCs.
研究领域:
材料科学
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能源科学
·
有机光电
✓ 已验证
DOI
PubMed
高影响因子
Solar RRL
·
2019
·Vol. 4
·期 4
·1900480
·
IF 0
Wenwu Zeng,Cong Xie,Wen Wang,Sheng Li,Xueshi Jiang,Sixing Xiong,Lulu Sun,Fei Qin,Hongwei Han,Yinhua Zhou
Tandem solar cells are attractive because they can break the Shockley–Queisser efficiency limit of single-junction cells. However, it is still quite challenging to fabricate efficient nonfullerene tandem organic solar cells (OSCs) because of their complicated and vulnerable multilayers and interfaces. The interconnecting layer (ICL) between two subcells is the key part in efficient tandem solar cells, which should be designed properly based on the property of active layers. Herein, the incorporation of hydrogen molybdenum bronze (H x MoO 3 ) between the bottom active layer and PEDOT:PSS/ZnO to form a new ICL is proposed. The contribution of the H x MoO 3 is two fold: 1) it can well wet the hydrophobic active layer surface and form a uniform film. It provides a hydrophilic surface for the following deposition of PEDOT:PSS; 2) the H x MoO 3 has a high work function of 5.4 eV that is higher than PEDOT:PSS (5.0 eV) and can extract holes more efficiently from the active layer with the deep highest occupied molecular orbital energy level. Nonfullerene tandem solar cells with a high fill factor of 76.0% and power conversion efficiency of 15.03% are obtained with this ICL.
研究领域:
材料科学
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能源技术
✓ 已验证
DOI
危险品化学品经营许可证（带存储）