Liang Zhenyao, Yuan Chen, Zhang Yang, Huang Le, Yang Yibin, Xiao Ye
School of Materials and Energy, Guangdong University of Technology, Guangzhou, 510006, China.
Heliyon. 2023 Mar 28;9(4):e14935. doi: 10.1016/j.heliyon.2023.e14935. eCollection 2023 Apr.
Stimulated by the extraordinary power conversion efficiency (PCE) of hybrid organic-inorganic perovskites (HOIP) based solar cells (SCs), the derivative studies on inorganic perovskites (IOP) based SCs have been intensely investigated. In order to overcome the disadvantages of CsPbBr, most prominently the unfavorable larger band gap (2.3eV), a grating layer of mesoporous anatase TiO(mp-TiO) has been inserted into the conventional configuration of SCs. The grating layer acts as the electron transfer layer (ETL) and light absorption strengthening layer at the same time. Due to the combined effects, the increased contacting area increased the fill factor (FF) and enhanced light trapping in the grating layer increased the short-current density, the average PCE of IOP based SCs has increased from 5.67% to 7.58%, which is a ca. 34% increase relatively. Furthermore, research on traditional HOIP-based SCs is also conducted. Interestingly, the increasing PCE mechanism is quite different from their inorganic counterparts, which should be attributed to the strain effect of different film structures. Thus, the strain-induced defect charge-state transitions of MAPbI by the grating layer increased the open-circuit voltage (V); and similarly, the increased contacting area also increased the FF, resulting in a 13% increase for PCE.
受基于有机-无机杂化钙钛矿（HOIP）的太阳能电池（SCs）卓越的功率转换效率（PCE）的刺激，对基于无机钙钛矿（IOP）的SCs的衍生研究得到了深入探讨。为了克服CsPbBr的缺点，最突出的是其不利的较大带隙（2.3eV），在SCs的传统结构中插入了一层介孔锐钛矿TiO（mp-TiO）光栅层。该光栅层同时充当电子传输层（ETL）和光吸收增强层。由于这些综合效应，增加的接触面积提高了填充因子（FF），而光栅层中增强的光捕获增加了短路电流密度，基于IOP的SCs的平均PCE从5.67%提高到了7.58%，相对提高了约34%。此外，还对传统的基于HOIP的SCs进行了研究。有趣的是，其PCE增加的机制与无机对应物有很大不同，这应归因于不同薄膜结构的应变效应。因此，光栅层引起的MAPbI的应变诱导缺陷电荷态转变增加了开路电压（V）；同样，增加的接触面积也提高了FF，导致PCE提高了13%。
