DALTON TRANSACTIONS
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2023
·Vol. 52
·期 43
·15974-15985
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IF 4
Pengyun Zhang,Jie Xiong,Wei-Hsiang Chen,Pingfan Du,Lixin Song
In recent years, air-processed MAPbI3 perovskite solar cells (PSCs) have attracted widespread interest from researchers worldwide because of their simple and low-cost fabrication process. Nonetheless, the ambient conditions usually bring about many adverse effects, such as imperfect crystallization and numerous defects in perovskite films, which seriously impact both the photoelectric performance and stability of the device. Therefore, in this work, a polymer dual-passivation strategy was employed by introducing ammonium polyphosphate (APP) as an additive to the green anti-solvent to accurately modify the perovskite layer. APP, which has abundant phosphate and ammonium groups, could simultaneously fill the I/Pb vacancies by Lewis acid–base reactions to restrain defect formation and improve the power conversion efficiency (PCE) of the ultimate device. On the other hand, the long molecular chains of the polymer with a certain flexural ability were easily congregated at the grain boundaries of the perovskite grains, thus enhancing the bending resistance. Consequently, high-quality perovskite films with a dense morphology and large grain size were obtained. Because of the reduced defect density and suppressed non-radiative recombination, the optimal PSC attained a champion PCE of 20.87% with negligible hysteresis. Furthermore, the non-encapsulated APP-modified flexible device also exhibited excellent bending resistance. Only 20% of its normalized PCE was lost after 150 bending cycles at room temperature. This simple, green, low-cost, and reliable strategy for preparing high-efficiency PSCs with good stability can facilitate its commercialization.
研究领域:
材料科学
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太阳能技术
·
化学工程
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产品关联
DOI
PubMed
高影响因子
Materials
·
2023
·Vol. 16
·期 17
·6064
·
IF 3.4
Menghan Duan,Yunpeng Wang,Pingli Zhang,Luchao Du
Organic inorganic perovskite materials have received increasing attention in the optoelectronic field because of their unique properties. The ultrafast dynamics of photogenerated carriers determine photoelectric conversion efficiency, thus, it is feasible to influence the dynamics behavior of photogenerated carriers by regulating A-site cations. This paper mainly used transient absorption spectra (TAS) technology to study the photogenerated carriers relaxation processes of organic–inorganic perovskite CsxMA1−xPbI3materials at different x values. Three sets of time constants were obtained by global fitting at different values of x. The experimental results showed that the crystal structure of perovskite could be affected by adjusting the Cs+doping amount, thereby regulating the carrier dynamics. The appropriate amount of A-cation doping not only maintained the organic–inorganic perovskite crystal phase, but also prolonged the photogenerated carrier’s lifetime. The 10% Cs+doping CsxMA1−xPbI3perovskite has potential for solar cell applications. We hope that our research can provide dynamics support for the development of organic–inorganic perovskite in solar cells.Keywords:Cs+doping MAPbI3perovskite;transient absorption spectra;crystal structure;carriers dynamics
研究领域:
材料科学
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光电子学
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太阳能电池研究
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DOI
PubMed
高影响因子
PHYSICA B-CONDENSED MATTER
·
2022
·
IF 2.988
Jianhua Li,Xilin Zhang,Zhifang Zhang,Tianxiao Liu,Lei Chen,Zhiyong Liu
The development of perovskite solar cells has improved rapidly. However, PSCs generally suffer from instability, due to the detrimental defects. Additive engineering is a favorable method for defect passivation. In this work, the linear pseudo-halogen salt, KSCN, is introduced into the MAPbI 3 perovskite film to improve the performance of PSC. The trap density of cells with SCN − is decreased significantly. The SCN − not only can fill halogen vacancies to reduce the halide-related defects, but also can interact with the uncoordinated Pb 2+ via coordinate bond to stabilize perovskite lattice structure. Moreover, the performance of devices with other linear pseudo-halogen anions (OCN − , SeCN − ) are also investigated. Due to the improved short circuit current density, the power conversion efficiency of devices increases from 18.02% (PVK) to 20.41% (PVK–SCN - ), 19.53% (PVK–OCN - ) and 19.23% (PVK–SeCN - ), respectively. After introducing pseudo-halide anions, the devices showed robust stability under the ambient environment.
研究领域:
材料科学
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能源技术
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DOI
高影响因子
Coatings
·
2024
·Vol. 14
·期 5
·633
·
IF 2.9
Xueqiong Su,Ruimin Wang,Huimin Yu,Jin Wang,Ruixiang Chen,He Ma,Li Wang
Although perovskite has great potential in optoelectronic devices, the simultaneous satisfaction of material stability and high performance is still an issue that needs to be solved. Most perovskite optoelectronic devices use quantum dot spin coating or the gas-phase growth of perovskite thin films as the photoelectric conversion layer. Due to stability limitations, these materials often experience a significant decrease in photoelectric conversion efficiency when encountering liquid reagents. The self-assembled growth of hybrid perovskite crystals determines superior lattice ordering and stability. There are three types of ionic liquids—[Emim]BF4, EMIMNTF2, and HMITFSI—that can effectively enhance the X-ray photoelectric conversion performance of hybrid perovskite crystal CH3NH3PbI3(MAPbI3), and the enhancement in the photocurrent leads to an improvement in the sensitivity of X-ray detectors. We soak the perovskite crystals in an ionic liquid and perform two treatment methods: electrification and dilution with ETOH solution. It is interesting to find that MAPbI3perovskite single crystal materials choose the same optimized ionic liquid species in X-ray detection and photovoltaic power generation applications, and the effect is quite the opposite. Compared with untreated MAPbI3crystals, the average photocurrent density of Electrify-HMITFSI MAPbI3increased by 826.85% under X-ray excitation and the sensitivity of X-ray detectors made from these treated MAPbI3crystals significantly increased by 72.6%, but the intensity of the PL spectrum decreased to 90% of the untreated intensity.
研究领域:
材料科学
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光电子学
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光伏
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辐射探测
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产品关联
DOI
高影响因子
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