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Large Conduction Band Energy Offset Is Critical for High Fill Factors in Inorganic Perovskite Solar Cells
ACS Energy Letters ( IF 22.0 ) Pub Date : 2020-06-17 , DOI: 10.1021/acsenergylett.0c00980
Qiong Wang 1 , Fengshuo Zu 2 , Pietro Caprioglio 3, 4 , Christian M. Wolff 3 , Martin Stolterfoht 3 , Meng Li 1, 5 , Silver-Hamill Turren-Cruz 1 , Norbert Koch 2, 5, 6 , Dieter Neher 3 , Antonio Abate 1, 7, 8
Affiliation  

Although SnO2 has been reported to give high efficiencies of over 20% for organic–inorganic perovskite solar cells and has been frequently used in perovskite tandem solar cells, very few contributions have explored its feasibility in inorganic perovskite solar cells (IPSCs). Inorganic perovskites with a wide bandgap tunable from 1.7 to 2.0 eV are promising candidates for top cells in tandem structures; development of IPSCs based on SnO2 will greatly benefit their integration into tandem solar cells. We examined SnO2 in comparison to the prevalent TiO2. We found that although SnO2 had a good energy alignment with the inorganic perovskite and exhibited slower nonradiative recombination, the relatively low conduction band minimum energy offset restricted efficient charge extraction. In contrast, TiO2 that had a large energy offset of ∼400 meV led to a high fill factor of 78.7% and a state-of-the-art efficiency of 14.2% for IPSCs with a bandgap of 1.93 eV.

中文翻译:

大的导带能量偏移对于无机钙钛矿太阳能电池的高填充因子至关重要

尽管据报道,SnO 2对于有机-无机钙钛矿太阳能电池具有超过20%的高效率,并且经常用于钙钛矿串联太阳能电池,但很少有人探索其在无机钙钛矿太阳能电池(IPSC)中的可行性。带隙可调范围从1.7到2.0 eV的无机钙钛矿是串联结构中最有希望的候选细胞。基于SnO 2的IPSC的开发将极大地有利于将它们集成到串联太阳能电池中。我们检查了SnO 2与普通TiO 2的比较。我们发现尽管SnO 2具有与无机钙钛矿良好的能量排列,并且显示出较慢的非辐射复合,相对较低的导带最小能量偏移限制了有效电荷的提取。相比之下,具有约400 meV的大能量偏移的TiO 2导致IPSC具有1.93 eV的带隙的高填充因子和78.2%的最新效率。
更新日期:2020-07-10
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