Spectroscopic Perception of Trap States on the Performance of Methylammonium and Formamidinium Lead Iodide Perovskite Solar Cells,Advanced Materials

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Spectroscopic Perception of Trap States on the Performance of Methylammonium and Formamidinium Lead Iodide Perovskite Solar Cells
Advanced Materials ( IF 27.4 ) Pub Date : 2021-08-02 , DOI: 10.1002/adma.202102241
Yong Zhang ₁ , Lei Gao ₁ , Xin Wei ₁ , Weijie Zhao ₁ , Wenhui Wang ₁ , Mengchen Wang ₁ , Ting Zheng ₁ , Hongwei Liu ₂ , Junpeng Lu ₁ , Zhenhua Ni ₁

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To enhance the efficiency and stability of the organic–inorganic hybrid perovskite (OIHP) solar cells, doping has been demonstrated as a straightforward method. Nevertheless, the perception of trap states regulated by doping and their effects on the performance of solar cells is not in-depth. Herein, typical OIHPs (CH₃NH₃PbI₃ and Cs_0.05FA_0.85MA_0.10Pb(I_0.97Br_0.03)₃) doped with RbI are employed to expound the doping mechanism in affecting the efficiency of devices. Systematic spectroscopic characterizations indicate that doping significantly influences the photocarrier dynamics via directly regulating the trap states. The results indicate that doping would reduce the trap density by passivating defects and induce extra trapping centers. This directly manipulates the transient transport of the photocarriers and finally influences the output of devices. The optimization of solar cell performance requires the tradeoff of competitive relation between the passivation and introduction of trapping centers. The results provide the spectroscopic perception on how doping concentration affects trap density, carrier dynamics, transport behavior, and ultimately the parameters of devices. It provides a straightforward guidance to the design and optimization of OIHP-based solar cells.

中文翻译：

陷阱态对甲基铵和甲脒碘化铅钙钛矿太阳能电池性能的光谱感知

为了提高有机-无机杂化钙钛矿（OIHP）太阳能电池的效率和稳定性，掺杂已被证明是一种简单的方法。然而，对掺杂调节的陷阱态及其对太阳能电池性能的影响的认识并不深入。在此，典型的 OIHPs (CH ₃ NH ₃ PbI ₃和 Cs _0.05 FA _0.85 MA _0.10 Pb(I _0.97 Br _0.03 ) ₃) 掺杂了 RbI 来阐述影响器件效率的掺杂机制。系统光谱表征表明，掺杂通过直接调节陷阱态显着影响光载流子动力学。结果表明，掺杂会通过钝化缺陷并诱导额外的陷阱中心来降低陷阱密度。这直接操纵光载流子的瞬态传输并最终影响器件的输出。太阳能电池性能的优化需要在钝化和引入俘获中心之间的竞争关系之间进行权衡。结果提供了关于掺杂浓度如何影响陷阱密度、载流子动力学、传输行为以及最终器件参数的光谱感知。

更新日期：2021-09-21

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