Solar RRL
·
2022
·Vol. 6
·期 7
·2200206
·
IF 9.173
Tongfa Liu,Yu Li,Rongguo Xu,Lingyun Lou,Jinqiang Gao,Kai Zhang,Mingzhu Su,Wei Qian,Gaopeng Wang,Shuang Xiao,Shihe Yang
An efficient perovskite junction is critical for the functioning of perovskite solar cells (PSCs). However, carbon-based perovskite solar cells (C-PSCs) have been plagued by the paucity of ways to construct an efficient junction between perovskite and carbon, staggering around an efficiency much lower than other state-of-the-art PSCs. Herein, a perovskite/carbon bulk heterojunction (BHJ) for C-PSCs is innovated and systematically studied. First, a two-step orthogonal solvent method is developed to deposit a series of high-quality perovskite films directly on the preformed perovskite film, allowing to manipulate compositions, band alignment, and charge transfer of the perovskite junction in a low-cost and straightforward fashion. Second, by adopting this method to a porous carbon electrode as originally motivated, fabrication of perovskite/carbon BHJ with perovskite crystals by seamlessly filling in the porous carbon film is successfully done, thus providing a high contact area of perovskite/carbon heterojunction. Such a BHJ accelerates hole collection of the carbon electrode from the perovskite layer, thus significantly boosting the performance of C-PSCs with MAPbI 3 as the active layer from 12% to over 16% with certification. The device is shown to be stable with no obvious degradation after 1700 h of continuous light soaking near the maximum power point.
研究领域:
材料科学
·
能源技术
·
光伏器件
✓ 已验证
DOI
高影响因子
Science China-Materials
·
2024
·Vol. 67
·期 5
·1564-1573
·
IF 6.8
Tian Ze,Wang Zhenxia,Ma Zizai,Li Jinping,Wang Xiaoguang
Photoinduced charge separation and transfer are the core factors affecting the photoelectrochemical performance of BiVO 4 -based photoanodes. Herein, a hole extraction layer was inserted between a BiVO 4 photoanode and an oxygen evolution cocatalyst (OEC). The introduction of Cu 2 O as a hole extraction layer between the OEC layer (FeOOH/NiOOH) and BiVO 4 optimized the migration paths and extended the lifetimes of the photogenerated holes, thus enhancing the photoelectrochemical performance of the photoelectrode. The charge separation efficiency of the optimized BiVO 4 /Cu 2 O/FeOOH/NiOOH photoanode was 92.0% significantly higher than the 70.6% efficiency for pure BiVO 4 . As expected, this photoanode also displayed a high photocurrent density of 3.85 mA cm −2 at 1.23 V RHE (under AM 1.5G illumination), which was 2.77 times greater than that of pure BiVO 4 . Our results indicate that electrodepositing a Cu 2 O hole extraction layer is a simple and scalable method for increasing the photoelectrochemical activity of BiVO 4 photoanodes for solar water splitting.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Chemistry
·
2022
·
IF 13.599
Qi Liu,Junming Qiu,Xianchang Yan,Yuemeng Fei,Yue Qiang,Qingyan Chang,Yi Wei,Xiaoliang Zhang,Wenming Tian,Shengye Jin,Ze Yu,Licheng Sun
All-inorganic CsPbIBr 2 perovskite solar cells (PSCs) have attracted considerable research attention in recent years due to their excellent thermal stability. However, their power conversion efficiencies (PCEs) are relatively low and still far below the theoretical limit. Here, we report the use of an organic dye molecule (namely VG1-C8) as a bifunctional interlayer between perovskite and the hole-transport layer in CsPbIBr 2 PSCs. Combined experimental and theoretical calculation results disclose that the multiple Lewis base sites in VG1-C8 can effectively passivate the trap states on the perovskite films. Meanwhile, the π-conjugated dye molecule significantly accelerates the hole extraction from the perovskite absorber as evidenced by the photoluminescence analysis. Consequently, the VG1-C8 treatment simultaneously boosts the photovoltage and photocurrent density values from 1.26 V and 10.80 mA cm −2 to 1.31 V and 12.44 mA cm −2 , respectively. This leads to a significant enhancement of PCE from 9.20% to 12.10% under one sun irradiation (AM 1.5G). To our knowledge, this is the record efficiency reported so far for CsPbIBr 2 PSCs. Thus, the present work demonstrates an effective interfacial passivation strategy for the development of highly efficient PSCs.
研究领域:
材料科学
·
光伏技术
·
界面工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2018
·Vol. 6
·期 10
·4365-4373
·
IF 9.931
Liguo Gao,Likun Wang,Xiaogang Ding,Erling Zhao,Shuzhang Yang,Yingyuan Zhao,Yanqiang Li,Shufeng Wang,Tingli Ma
The power conversion efficiency (PCE) of perovskite solar cells (PSCs) can be improved by introducing appropriate additives into perovskite precursor solutions. However, the exact role and mechanism of additives are still unclear. In this study, self-designed cognition experiments were conducted to improve the hole extraction efficiency, as well as to deeply understand the working principle of additives. A common hole transport material, 2,2′,7,7′-tetrakis[N,N-di(4-methoxyphenyl) amino]-9,9′-spirobifluorene (spiro-OMeTAD), was used as an additive for bulk heterojunction PSCs (BHJ-PSCs). The results showed that the PCE of mesoporous BHJ-PSCs (M-BHJ-PSCs) was enhanced by more than 15% when an extremely low concentration of spiro-OMeTAD additive was added. However, the crystallization of the perovskite was hampered and the recombination risk increased when grain boundaries increased in the perovskite layer. Planar BHJ-PSCs were fabricated to further investigate the role of additives. In comparison with those in planar BHJ-PSCs, the hole extraction efficiency and diffusion length significantly improved in M-BHJ-PSCs due to the transport paths and relay effects caused by the spiro-OMeTAD additive. Subsequently, exact functions and a new working principle of additives in BHJ-PSCs were proposed. This study may extend the possibilities of designing highly efficient PSCs through the promotion of additive research and application.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Haojie Sui,Benlin He,Junjie Ti,Shouhao Sun,Wenjing Jiao,Haiyan Chen,Yanyan Duan,Peizhi Yang,Qunwei Tang
The promotion of interfacial charge transfer and extraction plays an important role in further improving the power conversion efficiency (PCE) of perovskite solar cells (PSCs). Herein, a composite of WS 2 /AgIn 5 S 8 quantum dots (QDs) with lattice matching and suitable energy level is launched as an efficient hole extractor for carbon-based all-inorganic CsPbBr 3 PSCs. Due to the sulfur vacancy defects passivation of WS 2 QDs by AgIn 5 S 8 QDs and a Type-II band alignment between them, a boosted hole extraction and transfer is realized. In addition, the strong interaction of S of WS 2 /AgIn 5 S 8 QDs and the Pb of perovskite film constructs a convenient pathway of hole transport to promote hole transfer and heals the surface lead ions defects of perovskite film, and the uncoordinated bromine ions defects of CsPbBr 3 film are also passivated by the WS 2 /AgIn 5 S 8 QDs in the form of Ag-Br and In-Br bonds, leading to an inhibition of charge recombination. As a result, the carbon-based all-inorganic CsPbBr 3 PSCs with WS 2 /AgIn 5 S 8 QDs free of encapsulation deliver a maximum PCE of 10.24 % and a remarkably improved stability with over 93 % retention of the initial efficiency after being stored in air with high humidity and temperature (85 % RH, 85 °C) for 720 h.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2019
·
IF 6.019
Fan Bu,Benlin He,Yang Ding,Xueke Li,Xuemiao Sun,Jialong Duan,Yuanyuan Zhao,Haiyan Chen,Qunwei Tang
Carbon-based hole-transporting material (HTM)-free CsPbBr 3 perovskite solar cells (PSCs) provide new opportunities for promoting the commercial application of PSCs because of the low cost, simple preparation process and excellent stability under various extreme conditions. One of the remaining problems for inorganic CsPbBr 3 PSCs is the low power conversion efficiency (PCE) due to the large energy level difference and inefficient hole extraction at CsPbBr 3 /carbon interface. Herein, polyaniline/graphite (PANi/G) composites are incorporated into carbon electrode to tailor work function and to improve hole-selectivity of back electrode for enhanced energy level alignment and interfacial hole extraction, leading to a remarkably reduced energy loss and charge recombination. The HTM-free CsPbBr 3 PSC based on carbon-PANi/G electrode achieves a PCE of 8.87%, which is increased by 43.8% in comparison with 6.17% for the control device. Moreover, the unencapsulated device shows excellent long-term moisture tolerance with the initial PCE maintaining 93.5% even exposure to air atmosphere with 80% RH at 25 °C over 50 days. The successful improvement of energy level alignment and charge extraction in device by directly incorporating PANi/G composites into carbon electrode offers a promising strategy in developing low-cost and efficient HTM-free PSCs.
研究领域:
材料科学
·
能源技术
·
光伏器件
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2019
·
IF 7.467
Zhongqiang Wang,Zongtao Wang,Jian Guo,Jiale Dong,Yingjuan Zhou,Yanqin Miao,Bo Zhao,Yuying Hao,Hua Wang,Bingshe Xu,Shougen Yin
In this work, we report a solution processed hole extraction layer (HEL) for highly efficient organic solar cells (OSCs), which is formed by CuSCN and perylene . It shows that the introduction of perylene helps to polish the interface between HEL and active layers, leading to efficient charge transport and collection, diminished recombination loss , and thereby improving the photovoltaic performance . In poly[4,8-bis(5-(2-ethylhexyl)thiophen-2-yl)benzo[1,2- b ; 4,5- b ′]dithiophene-2,6-diyl-alt-(4-(2-ethylhexyl)-3-fluorothieno[3,4- b ]thiophene-)-2-carboxylate-2-6-diyl)]:[6,6]-phenyl C 71 -butyric acid methyl ester (PTB7-Th:PC 71 BM) based OSCs, over 9% enhancement of power conversion efficiency (PCE) is obtained in the cells using bilayer CuSCN/perylene as HEL compared with that of the reference cell using pure CuSCN as HEL. The advantage of bilayer CuSCN/perylene HEL is also confirmed in nonfullerene system. An improved PCE is also obtained after application of perylene in nonfullerene system based cell. Furthermore, superior air stability has been observed in CuSCN and CuSCN/perylene HEL based cells. The use of a bilayer CuSCN/perylene HEL proves a potential approach to obtain efficient and stable OSCs.
研究领域:
材料科学
·
光伏技术
·
有机电子学
✓ 已验证
DOI
高影响因子
2D Materials
·
2019
·Vol. 6
·期 4
·045017
·
IF 7.343
Zhongqiang Wang,Zhiyuan Wang,Zongtao Wang,Min Zhao,Yingjuan Zhou,Bo Zhao,Yanqin Miao,Peizhi Liu,Yuying Hao,Hua Wang,Bingshe Xu,Yucheng Wu,Shougen Yin
In this work, soluble two-dimensional (2D) material of antimonene quantum sheets (AMQSs) is used to form a bilayer hole extraction layer (HEL) with CuSCN. It proves that the application of AMQSs helps to passivate surface defects of CuSCN, resulting in diminished recombination loss and depressed exciton quenching effect, and thereby achieving improved photovoltaic performance. In OPVs based on poly[4,8-bis(5-(2-ethylhexyl)thiophen-2-yl)benzo[1,2-b;4,5-b']dithiophene-2,6-diyl-alt-(4-(2-ethylhexyl)-3-fluorothieno[3,4-b]thiophene-)-2-carboxylate-2-6-diyl)]: [6,6]-phenyl C71-butyric acid methyl ester (PTB7-Th:PC71BM), over 12% enhancement of power conversion efficiency (PCE) is observed compared to that of the reference cell fabricated with pure CuSCN as an HEL. The advantage of the bilayer CuSCN/AMQS HEL is also confirmed in non-fullerene systems of PBDB-T-2F:IT-4F and PTB7-Th:ITIC. In a cell based on PBDB-T-2F:IT-4F, a PCE of 10.14% was obtained after application of AMQSs, which improved by about 10% compared to that of the reference cell using pure CuSCN as an HEL. Furthermore, cells based on CuSCN and CuSCN/AMQS HEL exhibit superior air stability. The use of a bilayer CuSCN/AMQS HEL provides a promising approach to obtain efficient and stable organic solar cells.
研究领域:
材料科学
·
光伏技术
·
有机电子学
✓ 已验证
DOI
高影响因子
EcoMat
·
2021
·Vol. 3
·期 5
·e12134
·
IF 0
Weixia Lan,Jialu Gu,Shiwei Wu,Yan Peng,Min Zhao,Yingjie Liao,Tao Xu,Bin Wei,Liming Ding,Furong Zhu
Improved efficiency and stability of the organic solar cells (OSCs) are the critical considerations for practical applications. The interface between the interlayer and bulk heterojunction has recently been shown as one of the weak links associated with the degradation in the nonfullerene acceptor (NFA)-based OSCs. It shows that the removal of the interfacial chemical reactions between the 2-(3-oxo-2,3-dihydroinden-1-ylidene)malononitrile (INCN) moieties in NFA and poly(3,4-ethylenedioxythiophene)-polystyrene sulfonate (PEDOT:PSS) hole extraction layer (HEL) is desired for enhancing the device stability. In this work, we show that the use of a bilayer MoO 3 /antimonene HEL favors the operational stability in OSCs through maintaining a high built-in potential and suppression of an undesired interfacial reaction between INCN moieties in NFA and the PEDOT structures in PEDOT:PSS. A power conversion efficiency of 16.68% is also obtained for the OSCs with a bilayer MoO 3 /antimonene HEL, prepared using a blend system of PM6:Y6, demonstrating its suitability for high-performance OSCs.
研究领域:
材料科学
·
光伏技术
·
纳米材料
·
表面化学
·
器件物理
✓ 已验证
DOI
ADVANCED FUNCTIONAL MATERIALS
·
2020
·Vol. 30
·期 23
·2001557
·
IF 16.836
Xiaoqing Yang,Yonghui Chen,Pengyun Liu,Huimin Xiang,Wei Wang,Ran Ran,Wei Zhou,Zongping Shao
Perovskite solar cells (PSCs) are highly promising next-generation photovoltaic devices because of the cheap raw materials, ideal band gap of ≈1.5 eV, broad absorption range, and high absorption coefficient. Although lead-based inorganic-organic PSC has achieved the highest power conversion efficiency (PCE) of 25.2%, the toxic nature of lead and poor stability strongly limits the commercialization. Lead-free inorganic PSCs are potential alternatives to toxic and unstable organic-inorganic PSCs. Particularly, double-perovskite Cs 2 AgBiBr 6 -based PSC has received interests for its all inorganic and lead-free features. However, the PCE is limited by the inherent and extrinsic defects of Cs 2 AgBiBr 6 films. Herein, an effective and facile strategy is reported for improving the PCE and stability by introducing an N719 dye interlayer, which plays multifunctional roles such as broadening the absorption spectrum, suppressing the charge carrier recombination, accelerating the hole extraction, and constructing an appropriate energy level alignment. Consequently, the optimizing cell delivers an outstanding PCE of 2.84%, much improved as compared with other Cs 2 AgBiBr 6 -based PSCs reported so far in the literature. Moreover, the N719 interlayer greatly enhances the stability of PSCs under ambient conditions. This work highlights a useful strategy to boost the PCE and stability of lead-free Cs 2 AgBiBr 6 -based PSCs simultaneously, accelerating the commercialization of PSC technology.
研究领域:
光伏技术
·
材料科学
·
可再生能源
·
半导体器件
·
无机化学
✓ 已验证
DOI
高影响因子
ADVANCED MATERIALS
·
2017
·Vol. 29
·期 39
·1701221
·
IF 19.791
Bo Li,Yanan Zhang,Luyuan Zhang,Longwei Yin
Despite great progress in the photovoltaic conversion efficiency (PCE) of inorganic–organic hybrid perovskite solar cells (PSCs), the large-scale application of PSCs still faces serious challenges due to the poor-stability and high-cost of the spiro-OMeTAD hole transport layer (HTL). It is of great fundamental importance to rationally address the issues of hole extraction and transfer arising from HTL-free PSCs. Herein, a brand-new PSC architecture is designed by introducing multigraded-heterojunction (GHJ) inorganic perovskite CsPbBr x I 3− x layers as an efficient HTL. The grade adjustment can be achieved by precisely tuning the halide proportion and distribution in the CsPbBr x I 3− x film to reach an optimal energy alignment of the valance and conduction band between MAPbI 3 and CsPbBr x I 3− x . The CsPbBr x I 3− x GHJ as an efficient HTL can induce an electric field where a valance/conduction band edge is leveraged to bend at the heterojunction interface, boosting the interfacial electron–hole splitting and photoelectron extraction. The GHJ architecture enhances the hole extraction and conduction efficiency from the MAPbI 3 to the counter electrode, decreases the recombination loss during the hole transfer, and benefits in increasing the open-circuit voltage. The optimized HTL-free PCS based on the GHJ architecture demonstrates an outstanding thermal stability and a significantly improved PCE of 11.33%, nearly 40% increase compared with 8.16% for pure HTL-free devices.
研究领域:
光伏学
·
材料科学
·
半导体物理
·
可再生能源
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2024
·
IF 20.2
Tao Shan,Sunzai Ke,Xin Yang,Xuhui Yang,Bo Weng,Lijuan Shen,Min-Quan Yang
Photocatalytic selective oxidation of aromatic hydrocarbons plays an important role in the production of value-added chemicals. A key step in this process is the activation of C(sp 3 )-H bond by photogenerated holes. However, the inadequate hole generation and lack of surface adsorption-activation sites severely hinders the improvement in photocatalytic C-H bond oxidation. In particular, the random charge migration to the surface impedes the effective capture of holes by surface active sites to dissociate the C(sp 3 )-H bond. Here, we design and fabricate a Co 3 O 4 /Cs 3 Sb 2 Br 9 p-n heterojunction that effectively addresses these challenges. The p-n heterojunction forms strong built-in electric fields (BEF) facilitating spatial charge separation. Holes are accumulated on Co 3 O 4 , while electrons are accumulated on Cs 3 Sb 2 Br 9 , thereby offering abundant active holes and electrons. Moreover, Co 3 O 4 shows stronger adsorption and activation capacity for the C(sp³)-H bond, enabling the C(sp 3 )-H bond dissociation with low reaction energy barrier. Consequently, the holes are directionally extracted from photoactive Cs 3 Sb 2 Br 9 to catalytically active Co 3 O 4 under visible light irradiation, thereby accelerating the toluene oxidation. The optimized 5 % Co 3 O 4 /Cs 3 Sb 2 Br 9 exhibits a benzyl aldehyde (BAD) evolution rate of 5044 μmol g −1 h −1 and a benzyl alcohol (BA) production rate of 1820 μmol g −1 h −1 , which are 12 and 17 times higher than that of blank Cs 3 Sb 2 Br 9 , respectively.
研究领域:
材料科学
·
化学工程
·
光化学
·
催化
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）