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Efficient and Stable Tin Perovskite Solar Cells Enabled by Graded Heterostructure of Light‐Absorbing Layer
Solar RRL ( IF 6.0 ) Pub Date : 2020-06-23 , DOI: 10.1002/solr.202000240 Tianhao Wu 1 , Danyu Cui 1 , Xiao Liu 2 , Xiangyue Meng 2 , Yanbo Wang 1 , Takeshi Noda 2 , Hiroshi Segawa 3 , Xudong Yang 1 , Yiqiang Zhang 4 , Liyuan Han 1, 2, 4
Solar RRL ( IF 6.0 ) Pub Date : 2020-06-23 , DOI: 10.1002/solr.202000240 Tianhao Wu 1 , Danyu Cui 1 , Xiao Liu 2 , Xiangyue Meng 2 , Yanbo Wang 1 , Takeshi Noda 2 , Hiroshi Segawa 3 , Xudong Yang 1 , Yiqiang Zhang 4 , Liyuan Han 1, 2, 4
Affiliation
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Lead‐free tin perovskite solar cells (TPSCs) have attracted widespread attention in recent years due to their low toxicity, suitable bandgap, and high carrier mobility. However, the photovoltage and efficiency of TPSCs are still much lower than those of the lead counterparts because of the high trap density and unfavorable band structure in tin perovskite films. To overcome these issues, efficient and stable TPSCs with a graded heterostructure of light‐absorbing layer are reported, in which the narrow‐bandgap tin perovskite dominates at the bulk, whereas the wide‐bandgap tin perovskite is distributed with a gradient from bulk to surface. This heterostructure can selectively extract the photogenerated charge carriers at the perovskite/electron transport layer interface, reduce the density of trap states, and impede the oxidation process of Sn2+ to Sn4+ in air. As a consequence, this graded heterostructure of tin perovskite layer contributes to an increase of 120 mV in the open‐circuit voltage and a maximum power conversion efficiency of 11% for TPSCs with longer operational stability.
中文翻译：
梯度结构的吸光层使高效而稳定的钙钛矿锡太阳能电池成为可能
近年来，由于无铅锡钙钛矿太阳能电池（TPSC）的低毒性，合适的带隙和高载流子迁移率，引起了广泛的关注。但是，由于钙钛矿化锡膜中的高陷阱密度和不利的能带结构，TPSC的光电压和效率仍然远低于铅的同行。为了克服这些问题，据报道，高效，稳定的TPSC具有渐变的吸光层异质结构，其中窄带隙钙钛矿在主体中占主导地位，而宽带隙钙钛矿从主体到表面呈梯度分布。这种异质结构可以选择性地在钙钛矿/电子传输层界面处提取光生载流子，降低陷阱态的密度，并阻碍Sn的氧化过程。空气中2+至Sn 4+。因此，这种钙钛矿锡层的渐变异质结构有助于使开路电压增加120 mV，对于具有更长工作稳定性的TPSC而言，其最大功率转换效率为11％。
更新日期：2020-06-23
中文翻译：
梯度结构的吸光层使高效而稳定的钙钛矿锡太阳能电池成为可能
近年来，由于无铅锡钙钛矿太阳能电池（TPSC）的低毒性，合适的带隙和高载流子迁移率，引起了广泛的关注。但是，由于钙钛矿化锡膜中的高陷阱密度和不利的能带结构，TPSC的光电压和效率仍然远低于铅的同行。为了克服这些问题，据报道，高效，稳定的TPSC具有渐变的吸光层异质结构，其中窄带隙钙钛矿在主体中占主导地位，而宽带隙钙钛矿从主体到表面呈梯度分布。这种异质结构可以选择性地在钙钛矿/电子传输层界面处提取光生载流子，降低陷阱态的密度，并阻碍Sn的氧化过程。空气中2+至Sn 4+。因此，这种钙钛矿锡层的渐变异质结构有助于使开路电压增加120 mV，对于具有更长工作稳定性的TPSC而言，其最大功率转换效率为11％。
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