Materials Today Energy
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2021
·
IF 7.311
Yifeng Yao,Shiqi Li,Huixia Xu,Zhixiang Gao,Jingkun Ren,Yanxia Cui,Linfeng Cai,Furong Zhu,Yuying Hao
Realization of efficient charge extraction at the cathode and anode interfaces is still one of the challenges for improving the power conversion efficiency (PCE) of the semitransparent perovskite solar cells (PSCs). In this work, we report our effort to enhance the PCE of semitransparent PSCs by incorporating a pair of an energetically favorable cathode buffer layer (CBL) and a hole-transporting layer (HTL). The effects of different CBLs, e.g., bathophenanthroline, bathocuproine, and perylene diimide, on charge extraction efficiency and PCE of the semitransparent PSCs are analyzed. Scanning electron microscopy reveals that UV-plasma-treated poly(bis(4-phenyl) (2,4,6-trimethylphenyl) amine) (PTAA) HTL surface favors the growth of a uniform and dense functional CH 3 NH 3 (I 0.75 Br 0.15 ) 3 perovskite layer across the substrate, with a low defect density for suppressing charge recombination loss. An average PCE of 13.53% and 9.92% was obtained with combination of a bathocuproine CBL and a PTAA HTL measured from the indium tin oxide (ITO) side and Ag side, respectively. Semitransparent PSCs possess an encouraging large average open-circuit voltage of 1.13 V, and an average transparency of 21%. Achieving an efficient charge collection and retaining a high built-in potential across the CH 3 NH 3 (I 0.75 Br 0.15 ) 3 photoactive layer via interfacial modifications are a prerequisite for attaining high-performance semitransparent PSCs.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2021
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IF 13.273
Haipeng Jiang,Xin Qu,Li He,Zheng Lv,Dan Li,Fengyou Wang,Lin Fan,Jinghai Yang,Lili Yang,Yongsheng Yan
Additive engineering is an effective defect passivation strategy for perovskite solar cells since the functional groups of additives can form coordination with defects. With the diversification of additive molecule structure and their functional groups, the interaction among groups within molecules has become more and more remarkable. However, its corresponding influence mechanism on defects passivation of perovskite is still an open question. Herein, we pay attention to the long-range conjugation effect (LRCE) within additive molecules, since it can greatly influence the electron cloud density in the aromatic system and changes the inherent characteristics of functional groups to weaken their coordination ability. The electrostatic potential (ESP) and bond dissociation energy (BDE) calculation were used to prove that the relative position of –OH and –COOH groups within additives plays a great role in adjusting LRCE. And meta -structure of –OH and –COOH exhibits effective suppression on LRCE to make the groups maintain their inherent characteristics to the great extent. Based on this novel meta -structure additive design strategy, we selected 3-hydroxybenzoic acid (M2), 2-hydroxypyridine-4-carboxylic acid (M3) and 2-hydroxyquinoline-4-carboxylic acid (M4) as additives. These meta -position additives indeed effectively passivate the defects of perovskite films and gradually improve the device performance due to the introduction of heteroatom and more fused ring step by step. The MAPbI 3 -based device with M4 as additive achieved high V oc of 1.17 V and maximum power conversion efficiency (PCE) of 20.40%, and the hygroscopicity was further suppressed so that the unencapsulated PSCs stored for 1000 h in the atmospheric environment still maintain 80% of initial PCE. These results will open a new concept for the design of additive molecules for further development of PSCs.
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高影响因子
Nanoscale
·
2021
·Vol. 13
·期 35
·14915-14924
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IF 7.79
Weihai Sun,Jinjun Zou,Xiaobing Wang,Shibo Wang,Yitian Du,Fengxian Cao,Lan Zhang,Jihuai Wu,Peng Gao
Regardless of the impressive progress that perovskite solar cells (PSCs) have achieved, especially considering their power conversion efficiency (PCE) over 25%, traditional PSCs still contend with an inherent instability with exposure to humidity, which remains as a critical issue for the realization of commercial production. Herein, we proposed an effective pathway to relieve the instability of PSCs without sacrificing efficiency by introducing a 2D phase at the surface of the 3D perovskite film, based on a novel organic cyclohexylmethylammonium iodide (CMAI). The self-assembled thin 2D capping layer atop the 3D perovskite layer can not only reduce the ionic defects, but also serve as a protective barrier against moisture. Consequently, the champion device incorporating 2D perovskite capping layers delivered an open-circuit voltage (Voc) of 1.19 V, which contributes to an impressive PCE of 22.06% on account of the improved charge extraction and decreased non-radiative recombination. More importantly, an excellent long-term stability along with mitigated hysteresis was observed for the modified devices as a result of the suppressed ion migration and high humidity resistance of the 2D perovskite film. Our finding provides a comprehensive approach for simultaneously enhancing the efficiency and stability of PSCs through dimension engineering utilizing CMA-based 2D perovskite materials.
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PubMed
高影响因子
SOLAR ENERGY
·
2021
·
IF 5.742
Peng Zhang,Junjie Si,Fei Wang,Chong Jia,Yiqing Chen
At present, the inferior stability compared to the high power conversion efficiency (PCE) for halide perovskite solar cells (PSCs) is the foremost drawback to impede their potential applications. Here, our work incorporate bifunctional polycaprolactone (PCL) agent into perovskite precursors in order to enhance the performance and stability of the humid air-fabricated perovskite solar cells (PSCs). The mechanism of efficiency and stability improvement can be resulted from assist in growth of perovskite grain and passivation of trap states in grain boundaries. The proved reduction of defect-state density can be ascribed to the cross-link function of PCL agent with C O bond, which was distributed along the grain boundaries and could play the synthetic role of Lewis base and acid, consequently resulting in the suppressed carrier recombination both in the bulk perovskite films and interfaces. The corresponding best performance device generates a conversion efficiency of 19.78%, 26.6% higher than that of the pristine device and retains ~88% of the initial values after 21 days’ storage without any encapsulation in ambient air. The proposed bifunctional adding strategy and the mechanism study could probe into the improvement of both efficiency and stability of the PSCs fabricated under fully open air conditions.
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高影响因子
SOLAR ENERGY
·
2021
·
IF 5.742
Yujiao Li,Pin Lv,Chen Li,Fan Xu,Jinbiao Jia,Bingqiang Cao
Traditional P-i-N perovskite solar cells have achieved high efficiency over 25%, but the device structure is relatively complex, and generally requires expensive low-conductivity p-type organic semiconductors as hole transport materials. As a typical semiconductor, it is very important to realize the bipolar doping of methylamine lead iodine (CH 3 NH 3 PbI 3 ) that is the light-absorbing layer of perovskite solar cell. Also, it is significant to develop perovskite cells with new device structure. Here, we chose lithium iodide (LiI) as the dopant and successfully grow p-type Li + doped CH 3 NH 3 PbI 3 (MAPbI 3 :Li) perovskite films with low resistivity (10 3 Ω•cm). The temperature-dependent photoluminescence, Hall effect and Kelvin probe force microscope (KPFM) results strongly confirmed that Li + doping promotes the transformation of pristine weak n-type MAPbI 3 to intentionally doped p-type film. Subsequently, the p-type MAPbI 3 film is used as both the light absorption layer and hole transport layer, and form a PN heterojunction with n-type titanium dioxide (TiO 2 ), which is used as the electron transport layer, to construct the heterostructural perovskite cell with a photoelectric conversion efficiency (PCE) of 10.43%. The electron beam induced current (EBIC) signal also strongly confirms the existence of the PN heterojunction and the new working mechanism of such new solar cells.
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高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2021
·
IF 7.267
Jiahao Yan,Shaochuan Hou,Xiaoyan Li,Jingjing Dong,Li Zou,Meili Yang,Jie Xing,Hao Liu,Huiying Hao
CsPbBr 3 perovskite solar cell has become a hot research object due to its excellent stability. It has been proved that anti-solvent washing is a good way to improve the crystal quality of organic-inorganic hybrid perovskite materials using a one-step spin-coating method. However, it is rarely reported in the preparation of all-inorganic perovskite materials. Here, an anti-solvent rinsing strategy was introduced for the synthesis of CsPbBr 3 films via the multi-step spin-coating process. We found that the addition of anti-solvent with high boiling points could significantly improve the surface morphology and crystal quality of CsPbBr 3 films by optimizing the nucleation and crystallization of PbBr 2 films. By virtue of the anti-solvent rinsing strategy, the highest efficiency of 9.6% and long-term stability over 800 h in ambient air without encapsulation were achieved. Our conclusions provide a certain reference value for the preparation of highly efficient and stable CsPbBr 3 perovskite solar cells.
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高影响因子
CHEMICAL PHYSICS LETTERS
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2021
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IF 2.328
Pin Lv,Xiaobing Liu,Yujiao Li,Wenhu Zhang,Yangqing Wu,Jia Dong,Wenzhi Wang,Hairui Sun,Bingqiang Cao
The serious energy level mismatch between the perovskite layer and the collecting electrode in direct contact is the main reason limiting the efficiency improvement of perovskite solar cell without transport layer. Here, zero-dimensional CsPbBr 3 quantum dots with tunable energy levels is used to modify the interface of the hole transport layer free perovskite solar cell, adjust the level distribution of the interface, promote the effective extraction of holes and suppress the injection of electrons, and successfully improve the photoelectric conversion efficiency of the hole transport layer free perovskite solar cell by 1.25 times.
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高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
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2021
·Vol. 168
·期 9
·094506
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IF 4.316
Yiwen Nie,Junjie Chen,Zhihui Wu,Jinyue Zhou,Zhenghan Li,Shanjun Gao,Chunhui Shen
Aliphatic polymers, such as polypropylene, styrene ethylene butylene styrene and norbornene, which show great alkaline stability and flexibility, have become the main research trend of the skeleton of anion exchange membranes. Here, we prepared a copolymer with all carbon atoms on the main chain. Firstly, a new vinylimidazole cationic monomer was prepared, and then copolymerized with styrene and acrylonitrile to obtain a copolymer (PASIm). Furthermore, (2,6-dimethyl-1,4-phenylene oxide) (PPO) was introduced to cross-link with PSAIm to prepare AEMs with different crosslinking degrees (CEM-X, X = 6,12,18,24,30). 1H NMR and FT-IR showed that PASIm was successfully synthesized and crosslinked with PPO. The prepared membranes had high hydroxide ionic conductivity and excellent alkaline stability. AFM showed that the CEM-18 had obvious microphase separation structure, which was beneficial to the construction of ion channels in the membrane. Thus, the CEM-18 showed the highest ionic conductivity, up to 59.21 mS cm−1 at 80 °C. CEM-24 with higher crosslinking degree showed the highest alkaline stability. After immersing in 1 M KOH solution at 80 °C for 240 h, 86.52% of the initial ionic conductivity was retained. These results indicate that the prepared anion exchange membranes have broad application prospects.
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高影响因子
Journal of Materials Chemistry C
·
2021
·Vol. 9
·期 40
·14217-14225
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IF 7.393
Junyi Huang,Chen Dong,Yantao Mei,Xiayao Lu,Gentian Yue,Yueyue Gao,Rong Liu,Weifeng Zhang,Furui Tan
Lead-free metal halide perovskites have attracted extensive attention as promising optoelectronic semiconductors with environmental friendliness. Cs2SnI6, a double perovskite with both a good phase and composition stability, is an appealing candidate for potential application in optoelectronic devices. To date, few reports have focused on the facile fabrication of dense and uniform Cs2SnI6 films that are key components for optoelectronic devices. Herein, a simple and low-cost solution method is reported to prepare densely packed Cs2SnI6 thin films. It was found that strategic precursor-compensation treatment (PCT) of the as-prepared spin-coated Cs2SnI6 thin films compensates the evaporation loss of volatile SnI4 and thus allows for pinhole-free and pure-phase double perovskite. The modified n-type Cs2SnI6 double perovskite shows enhanced conductivity and mobility with decreased charge recombination loss. As a result, the applied photodetectors show an enhanced photocurrent gain of 151 compared to that of 88 for the control sample. The responsivity (control 0.0059 mA W−1 to target 1.07 mA W−1) and detectivity (control 2.94 × 1010 Jones to target 6.03 × 1010 Jones) of the device were significantly improved in the self-powered mode. In addition, the PCT-Cs2SnI6 photodetectors show excellent long-time stability with 98% initial detectivity retained after storing in ambient environment for 28 days. This study paves the way for the preparation of high-quality Cs2SnI6 films for application in efficient optoelectronic devices.
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高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2021
·
IF 7.267
Jingjing Liu,Biao Shi,Qiaojing Xu,Yucheng Li,Bingbing Chen,Qi Wang,Pengyang Wang,Ying Zhao,Xiaodan Zhang
Pure vapor method shows particular advantages in preparing large-area uniform and conformal perovskite film, which can be applied to manufacture perovskite modules and fully textured perovskite/silicon tandem solar cells (TSCs). Here, we provide details on controlling the vapor-solid reaction to acquire high-quality perovskite films, including precisely adjusting vapor pressure and organic salts component, vapor-solid reaction, and post-annealing perovskite film. By employing the optimized conditions, we obtained high-quality perovskite films. Power conversion efficiency (PCE) of the inverted structure device can reach as high as 18.1% with an absorber bandgap of 1.62 eV, among the highest PCE using the vapor technique ( Table S1 ). Significantly, the large-area perovskite film has uniform crystallinity and coverage on textured silicon . Thus, the pure vapor fabrication method of perovskite films shed light on the application of perovskite solar cells because of the potential in module and tandem solar cells.
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高影响因子
SOLAR ENERGY
·
2021
·
IF 5.742
Zhiying Feng,Zhetao Xia,Zhixing Wu,Yikun Hua,Guang Zhu,Xiaohong Chen,Sumei Huang
Nowadays, the photovoltaic (PV) performance of metal halide perovskite solar cells (PVSCs) is limited by defect state induced recombination at charge transport electrode/perovskite interfaces. These defects, most commonly under-coordinated lead and halide ions, have to be eliminated or passivated in order to promote the device efficiency towards its theoretical limit. In this work, a simple and effective passivation method is reported for PVSCs by employing cis -9-octadecenylamine (CODA), a frequently-used organic surfactant. The CODA passivation layer is positioned between the perovskite absorber and hole transport layer (HTL). The passivated layer is deposited by a spin-coating method and modulated by changing the CODA concentration. We find that the amine ligands on the CODA surfactant are likely to conduce to the distinguished passivation via forming coordination bonds with Pb 2+ or I − ions, and hydrophobic connecting alkyl chain networks assembled on the top perovskite absorber surface also helps to resist penetration of humidity and hamper ion migration. CODA is able to efficiently reduce the charge trapping densities by passivating and/or decreasing of defects. Eventually, at an optimal CODA concentration, the perovskite absorbers that are amply passivated by CODA make the devices achieve a high open-circuit voltage ( V OC ) of 1.15 V and a champion efficiency of 20.87%. The resulting unpackaged device displays considerably enhanced ambient stability over 144 h while maintaining over 80% of its original efficiency under the relative humidity of 50% in the ambient air.
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高影响因子
ACS Sustainable Chemistry & Engineering
·
2021
·
IF 8.198
Tingting Zhong,Lei Shi,Huiying Hao,Jingjing Dong,Kunpeng Tang,Xiang Xu,Shindume Lomboleni Hamukwaya,Hao Liu,Jie Xing
In order to further promote the commercial application of perovskite solar cells (PSCs), it is particularly important to fabricate devices in the ambient air condition. Herein, we explore a simple method to reproduce high-efficiency and stable PSCs using the one-step anti-solvent deposition conducted in the full ambient air. NH4Ac (ammonium acetate), which is green and environmentally friendly, is first introduced into an anti-solvent (ethyl acetate) to enhance the photovoltaic performance and stability of devices. NH4+ causes the intermediate phase to undergo a process of cation exchange, thereby delaying crystallization. Ac– makes the additive and A-site cation form hydrogen bonds, which in turn makes the intermediate phase more stable. The dual effects of NH4+ and Ac– delay the crystallization of the perovskite film, reduce the density of defect states, and decrease the non-radiative recombination of carriers. By optimizing the concentration of NH4Ac, a champion power conversion efficiency (PCE) of 20.41% and an average PCE of 19.46 ± 0.64% are achieved, which is currently one of the highest efficiencies in fabricating PSCs under the full ambient air condition. Furthermore, the corresponding PSCs without encapsulation can maintain 82% of its initial PCE when stored in full ambient air condition (30–40% RH) for 30 days.
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高影响因子
危险品化学品经营许可证（带存储）