通过界面修饰消除无滞后钙钛矿太阳能电池的光吸收效应,The Journal of Physical Chemistry C

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通过界面修饰消除无滞后钙钛矿太阳能电池的光吸收效应
The Journal of Physical Chemistry C ( IF 3.7 ) Pub Date : 2020-01-13 , DOI: 10.1021/acs.jpcc.9b10022
Cheng Yang ₁ , Ziyang Hu ₁ , Can Gao ₁ , Yanyan Wang ₁ , Houcheng Zhang ₁ , Jun Wang ₁ , Jing Zhang ₁ , Xingfei Zhou ₁ , Yuejin Zhu ₁

Affiliation

在工作条件下，在有机金属卤化物钙钛矿太阳能电池（PSC）中观察到了磁滞效应和吸光效应，这阻碍了对功率输出的精确评估。导致这些影响的机制鲜为人知。在这里，我们的研究表明，光吸收效应与无滞后PSC中的电子选择层/钙钛矿界面有关。引入CH ₃ NH ₃的[6,6]-苯基C _61-丁酸甲酯（PC ₆₁ BM）由于有效的电荷转移，I分子作为界面层可以有效释放或消除这种影响，并具有19％的最佳稳定输出效率和84％以上的超高填充率。由电化学阻抗谱得出的电容-电压和电容-频率曲线表明，PSC中的光吸收效应主要源自PC ₆₁ BM /钙钛矿界面处的电荷积累。PC _61中掺杂的CH ₃ NH ₃ IBM阻止了钙钛矿之间的离子移动，从而消除了光吸收效应。此外，提出了一种将离子迁移和电荷积累过程结合起来的模型，以解释PSC中的光吸收效果和性能改进。

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Elimination of Light-Soaking Effect in Hysteresis-Free Perovskite Solar Cells by Interfacial Modification

The hysteresis and light-soaking effect have been observed in organo–metal halide perovskite solar cells (PSCs) under operating conditions, which inhibit the precise evaluation of power output. The mechanisms leading to these effects are little understood. Here, our studies have demonstrated that the light-soaking effect is related to the electron selective layer/perovskite interface in hysteresis-free PSCs. The introduction of [6,6]-phenyl C₆₁-butyric acid methyl ester (PC₆₁BM) doped with CH₃NH₃I molecules as the interfacial layer can effectively release or eliminate this effect due to the efficient charge transfer, accompanied with the best stable output efficiency of 19% and an ultrahigh fill factor over 84%. Capacitance–voltage and capacitance–frequency curves derived from electrochemical impedance spectroscopy demonstrate that the light-soaking effect in PSCs mainly originates from the charge accumulation at the PC₆₁BM/perovskite interface. The CH₃NH₃I doped in PC₆₁BM forestalls the ion movement among the perovskite and thus eliminates the light-soaking effect. Furthermore, a model that combines ion migration and the charge accumulation process to interpret the light-soaking effect and performance improvement in PSCs is proposed.

更新日期：2020-01-13

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