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In Situ Growth of 2D Perovskite Capping Layer for Stable and Efficient Perovskite Solar Cells
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2018-02-13 , DOI: 10.1002/adfm.201706923 Peng Chen 1 , Yang Bai 1 , Songcan Wang 1 , Miaoqiang Lyu 1 , Jung-Ho Yun 1 , Lianzhou Wang 1
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2018-02-13 , DOI: 10.1002/adfm.201706923 Peng Chen 1 , Yang Bai 1 , Songcan Wang 1 , Miaoqiang Lyu 1 , Jung-Ho Yun 1 , Lianzhou Wang 1
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2D halide perovskites have recently been recognized as a promising avenue in perovskite solar cells (PSCs) in terms of encouraging stability and defect passivation effect. However, the efficiency (less than 15%) of ultrastable 2D Ruddlesden–Popper PSCs still lag far behind their traditional 3D perovskite counterparts. Here, a rationally designed 2D‐3D perovskite stacking‐layered architecture by in situ growing 2D PEA2PbI4 capping layers on top of 3D perovskite film, which drastically improves the stability of PSCs without compromising their high performance, is reported. Such a 2D perovskite capping layer induces larger Fermi‐level splitting in the 2D‐3D perovskite film under light illumination, resulting in an enhanced open‐circuit voltage (Voc) and thus a higher efficiency of 18.51% in the 2D‐3D PSCs. Time‐resolved photoluminescence decay measurements indicate the facilitated hole extraction in the 2D‐3D stacking‐layered perovskite films, which is ascribed to the optimized energy band alignment and reduced nonradiative recombination at the subgap states. Benefiting from the high moisture resistivity as well as suppressed ion migration of the 2D perovskite, the 2D‐3D PSCs show significantly improved long‐term stability, retaining nearly 90% of the initial power conversion efficiency after 1000 h exposure in the ambient conditions with a high relative humidity level of 60 ± 10%.
中文翻译：
用于稳定和高效钙钛矿太阳能电池的2D钙钛矿封盖层的原位生长
就鼓励稳定性和缺陷钝化效果而言，二维卤化物钙钛矿最近已被认为是钙钛矿太阳能电池（PSC）的有前途的途径。但是，超稳定的2D Ruddlesden-Popper PSC的效率（不到15％）仍然远远落后于传统的3D钙钛矿同类产品。在此报道了一种通过在3D钙钛矿薄膜上原位生长2D PEA 2 PbI 4覆盖层而合理设计的2D-3D钙钛矿叠层体系结构，这在不损害其高性能的情况下极大地提高了PSC的稳定性。这种2D钙钛矿覆盖层在光照下会在2D-3D钙钛矿膜中引起更大的费米能级分裂，从而导致开路电压（V oc），因此在2D-3D PSC中的效率更高，为18.51％。时间分辨的光致发光衰减测量表明2D-3D叠层钙钛矿薄膜中的空穴提取变得容易，这归因于优化的能带排列和在亚能隙状态下减少的非辐射复合。得益于2D钙钛矿的高耐湿性和抑制的离子迁移，2D-3D PSC的长期稳定性得到了显着改善，在环境条件下暴露1000 h后，仍保持了近90％的初始功率转换效率。相对湿度高60±10％。
更新日期：2018-02-13
中文翻译：
用于稳定和高效钙钛矿太阳能电池的2D钙钛矿封盖层的原位生长
就鼓励稳定性和缺陷钝化效果而言，二维卤化物钙钛矿最近已被认为是钙钛矿太阳能电池（PSC）的有前途的途径。但是，超稳定的2D Ruddlesden-Popper PSC的效率（不到15％）仍然远远落后于传统的3D钙钛矿同类产品。在此报道了一种通过在3D钙钛矿薄膜上原位生长2D PEA 2 PbI 4覆盖层而合理设计的2D-3D钙钛矿叠层体系结构，这在不损害其高性能的情况下极大地提高了PSC的稳定性。这种2D钙钛矿覆盖层在光照下会在2D-3D钙钛矿膜中引起更大的费米能级分裂，从而导致开路电压（V oc），因此在2D-3D PSC中的效率更高，为18.51％。时间分辨的光致发光衰减测量表明2D-3D叠层钙钛矿薄膜中的空穴提取变得容易，这归因于优化的能带排列和在亚能隙状态下减少的非辐射复合。得益于2D钙钛矿的高耐湿性和抑制的离子迁移，2D-3D PSC的长期稳定性得到了显着改善，在环境条件下暴露1000 h后，仍保持了近90％的初始功率转换效率。相对湿度高60±10％。
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