Modulating the deep-level defects and charge extraction for efficient perovskite solar cells with high fill factor over 86%
Modulating the deep-level defects and charge extraction for efficient perovskite solar cells with high fill factor over 86%
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DOI：
10.1039/d2ee02543d
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发表时间：
2022-09-27
影响因子：
32.5
通讯作者：
Yang, Shangfeng
中科院分区：
文献类型：
--
作者：
Li, Xingcheng;Wu, Xin;Yang, Shangfeng
由于其飙升的功率转换，Percent太阳能电池（PSC）引起了前所未有的关注;然而，其报道的填充因子（FF）仍然落后于商业化太阳能电池，并且缺乏对机制的全面了解。在这里，我们采用了一种简单有效的策略，通过均匀掺入CsPbBr 3晶体，将FF提高到Shockley-Queisser（S-Q）极限的96.3%，这可以显着钝化深能级空穴缺陷，从而导致空穴迁移率显著增强，以平衡电子迁移率。结果，非辐射复合被抑制沿着增强的载流子提取效率，导致25.09%的显著PCE（认证：24.66%），具有86.9%的记录FF，这是所报道的PSC中最高的FF。深入的分析表明，这种策略可以同时减少由串联电阻，分流电阻和非辐射复合引起的FF损耗。这一工作提供了一个有效的策略，以促进FF接近理论极限。
Perovskite solar cells (PSCs) have drawn unprecedented attention due to their skyrocketing power conversion; however, their reported fill factors (FFs) still lag behind those of commercialized solar cells, and there is a lack of a comprehensive understanding of the mechanism. Here, we employed a facile and effective strategy to improve the FF to 96.3% of the Shockley-Queisser (S-Q) limit through homogeneous incorporation of CsPbBr3 crystals, which could significantly passivate deep-level hole defects, thereby leading to dramatically enhanced hole mobility to balance with electron mobility. As a result, the non-radiative recombination is suppressed along with enhanced carrier extraction efficiency, resulting in a remarkable PCE of 25.09% (certified: 24.66%) with a record FF of 86.9%, which is the highest FF among those of the reported PSCs. An in-depth analysis suggests that this strategy could concurrently reduce the FF loss caused by series resistance, shunt resistance, and non-radiative recombination. This work provides an efficient strategy to promote the FF to approach the theoretical limit.