As a candidate for next-generation solar devices, perovskite solar cells are increasingly being studied for their rapid increased power conversion efficiency (PCE). One of the possible routes to further increase PCE is the introduction of polarization in the absorption layer which functions as a method for increasing the built-in potential and reducing the interface barrier, leading to much improved carrier separation and extraction. This technique uses the principle of the piezophototronic effect utilized for obtaining enhanced optoelectronic performances. Herein, to introduce internal polarization while maintaining optical absorption performance of the perovskite, organic–inorganic hybrid perovskite composite film solar cells are fabricated by doping polarized polyvinylidenefluoride-co-trifluoroethylene (P(VDF-TrFE)) into the perovskite. The composite film is polarized with an external potential, subsequently inducing the piezophototronic effect to enhance the performances of perovskite solar cells. Experimental results show that this simple polarization method has effectively improved several key characteristics of the solar cell. The PCE has reached up to 22.1%, the short-circuit current (J_sc) increases to 24.2 mA cm⁻², and the open-circuit voltage (V_oc) increases to 1.18 V.

中文翻译：

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基于P(VDF-TrFE)的压电光电效应增强钙钛矿太阳能电池

作为下一代太阳能设备的候选者，钙钛矿太阳能电池因其快速提高的功率转换效率（PCE）而受到越来越多的研究。进一步增加 PCE 的可能途径之一是在吸收层中引入极化，这是一种增加内置电位和降低界面势垒的方法，从而大大改善载流子分离和提取。该技术利用压电光电效应原理来获得增强的光电性能。在此，为了在保持钙钛矿的光吸收性能的同时引入内部偏振，通过将偏振聚偏二氟乙烯-三氟乙烯（P（VDF-TrFE））掺杂到钙钛矿中来制造有机-无机杂化钙钛矿复合膜太阳能电池。复合薄膜在外部电位下极化，随后诱导压电光电效应以提高钙钛矿太阳能电池的性能。实验结果表明，这种简单的极化方法有效地改善了太阳能电池的几个关键特性。PCE已达到22.1%，短路电流（J _sc ) 增加到 24.2 mA cm ^-2，开路电压 ( V _oc ) 增加到 1.18 V。