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Mitigating Voc Loss in Tin Perovskite Solar Cells via Simultaneous Suppression of Bulk and Interface Nonradiative Recombination
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2022-08-31 , DOI: 10.1021/acsami.2c12129 Yali Chen 1 , Kun Wang 2, 3 , Heng Qi 1 , Youqian Zhang 1 , Ting Wang 1 , Yu Tong 1 , Hongqiang Wang 1
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2022-08-31 , DOI: 10.1021/acsami.2c12129 Yali Chen 1 , Kun Wang 2, 3 , Heng Qi 1 , Youqian Zhang 1 , Ting Wang 1 , Yu Tong 1 , Hongqiang Wang 1
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Tin-based perovskite solar cells (PSCs) have recently attracted extensive attention as a promising alternative to lead-based counterparts due to their low toxicity and narrow band gap. However, the severe open-circuit voltage (Voc) loss remains one of the most significant obstacles to further improving photovoltaic performance. Herein, we report an effective approach to reducing the Voc loss of tin-based PSCs. We find that introducing ethylammonium bromide (EABr) as an additive into the tin perovskite film can effectively reduce defect density both in the tin perovskite film and at the surface as well as optimize the energy level alignment between the perovskite layer and [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) transport material, thereby suppressing nonradiative recombination both in the bulk film and at the interface. Furthermore, it is demonstrated that the Voc loss is gradually mitigated along with increasing storage duration due to the slow passivation effect. As a result, a remarkable Voc of 0.83 V is achieved in the devices optimized with the EABr additive, which shows a significantly improved power conversion efficiency (PCE) of 10.80% and good stability.
中文翻译：
通过同时抑制体和界面非辐射复合来减轻锡钙钛矿太阳能电池中的 Voc 损失
锡基钙钛矿太阳能电池（PSC）最近因其低毒性和窄带隙而作为铅基对应物的有前途的替代品引起了广泛关注。然而，严重的开路电压 ( Voc )损耗仍然是进一步提高光伏性能的最重要障碍之一。在此，我们报告了一种减少V oc的有效方法锡基 PSC 的损失。我们发现，将溴化乙基铵 (EABr) 作为添加剂引入到钙钛矿薄膜中，可以有效降低钙钛矿薄膜和表面的缺陷密度，并优化钙钛矿层和 [6,6] 之间的能级排列。 -苯基-C61-丁酸甲酯 (PCBM) 传输材料，从而抑制体膜和界面处的非辐射复合。此外，由于缓慢的钝化效应，证明了随着存储时间的增加， V oc损失逐渐减轻。结果，一个显着的V oc在使用 EABr 添加剂优化的器件中实现了 0.83 V，这表明功率转换效率 (PCE) 显着提高了 10.80% 和良好的稳定性。
更新日期：2022-08-31
中文翻译：
通过同时抑制体和界面非辐射复合来减轻锡钙钛矿太阳能电池中的 Voc 损失
锡基钙钛矿太阳能电池（PSC）最近因其低毒性和窄带隙而作为铅基对应物的有前途的替代品引起了广泛关注。然而，严重的开路电压 ( Voc )损耗仍然是进一步提高光伏性能的最重要障碍之一。在此，我们报告了一种减少V oc的有效方法锡基 PSC 的损失。我们发现，将溴化乙基铵 (EABr) 作为添加剂引入到钙钛矿薄膜中，可以有效降低钙钛矿薄膜和表面的缺陷密度，并优化钙钛矿层和 [6,6] 之间的能级排列。 -苯基-C61-丁酸甲酯 (PCBM) 传输材料，从而抑制体膜和界面处的非辐射复合。此外，由于缓慢的钝化效应，证明了随着存储时间的增加， V oc损失逐渐减轻。结果，一个显着的V oc在使用 EABr 添加剂优化的器件中实现了 0.83 V，这表明功率转换效率 (PCE) 显着提高了 10.80% 和良好的稳定性。
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