Comprehensive insights into defect passivation and charge dynamics for FA0.8MA0.15Cs0.05PbI2.8Br0.2 perovskite solar cells
| Autor: | Xiangyang Liu, Hengchuan Ding, Xia Du, Chaoran Qin, Yunkang Cui, Xinsheng Liu |
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| Rok vydání: | 2020 |
| Předmět: |
010302 applied physics
Materials science Physics and Astronomy (miscellaneous) Passivation business.industry Surface photovoltage Heterojunction 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Dielectric spectroscopy Hysteresis Formamidinium 0103 physical sciences Optoelectronics Grain boundary 0210 nano-technology business Perovskite (structure) |
| Zdroj: | Applied Physics Letters. 117:013503 |
| ISSN: | 1077-3118 0003-6951 |
| Popis: | Nonradiative charge recombination is the main restriction on the high efficiency of organic–inorganic hybrid perovskite solar cells (PVSCs). The synergistic manipulation of the grain boundary/interface traps can control charge behavior and improve device performance. In our work, the composition of perovskite used is FA0.8MA0.15Cs0.05PbI2.8Br0.2 (MA is methylammonium, FA is formamidinium), which produces high-performing PVSCs. A trace additive of n-butylammonium bromide (BABr) was incorporated into the perovskite precursor to passivate grain–boundary defects. The NH4Cl/KCl was spin-coated onto the electron-transport layer to modify interface contact and impede nonradiative charge recombination, inducing a high power-conversion efficiency (PCE). The highest-performing PVSCs achieved a PCE of 21.02%, a Voc of 1.13 V, a Jsc of 23.55 mA cm−2, and a FF of 0.79 under a reverse voltage scan (under a forward voltage scan the values were as follows: PCE, 20.13%; Voc, 1.12 V; Jsc, 23.65 mA cm−2; FF, 0.76), with a negligible J–V hysteresis. The hybrid 2D/3D perovskite heterostructure formed through the incorporation of BABr increased crystallinity and mitigated nonradiative recombination, resulting in reduced current-voltage hysteresis, enhanced efficiency, and significantly improved operational stability. With impedance spectroscopy and time-resolved surface photovoltage spectroscopy, the charge dynamics in PVSCs were determined. |
| Databáze: | OpenAIRE |
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