Efficient and stable tin-based perovskite solar cells by introducing π-conjugated Lewis base
Efficient and stable tin-based perovskite solar cells by introducing π-conjugated Lewis base
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DOI：
10.1007/s11426-019-9653-8
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发表时间：
2019-12
期刊：
影响因子：
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通讯作者：
Tianhao Wu;Xiao Liu;Xin He;Yanbo Wang;Xiangyue Meng;T. Noda;Xudong Yang;Liyuan Han
中科院分区：
文献类型：
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作者：
Tianhao Wu;Xiao Liu;Xin He;Yanbo Wang;Xiangyue Meng;T. Noda;Xudong Yang;Liyuan Han
锡基钙钛矿太阳能电池(TPSCs)作为最有前途的无铅PSCs候选材料，在世界范围内引起了广泛的研究。然而，锡基钙钛矿在溶液沉积过程中结晶速度过快，导致针孔丰富，均匀性差，导致钙钛矿层内电荷复合严重。在这里，我们利用具有高电子密度的π共轭刘易斯碱分子来系统地控制钙钛矿FASnI3的结晶速度，通过与SnI骨架形成稳定的中间相，从而获得致密而均匀的钙钛矿膜，并大大提高了载流子寿命。同时，π共轭体系的引入也延缓了水分向钙钛矿晶体的渗透，从而显著抑制了薄膜在空气中的降解。这些好处使TPSCs的功率转换效率(PCE)稳定在10.1%，并在1000小时的光照下浸泡在空气中后保持了初始PCE的90%以上。此外，在经认可的测试中心认证的稳态效率为9.2%。
Tin-based perovskite solar cells (TPSCs) as the most promising candidate for lead-free PSCs have incurred extensive researches all over the world. However, the crystallization process of tin-based perovskite is too fast during the solution-deposited process, resulting in abundant pinholes and poor homogeneity that cause serious charge recombination in perovskite layer. Here, we employed the π-conjugated Lewis base molecules with high electron density to systematically control the crystallization rate of FASnI3perovskite by forming stable intermediate phase with the Sn-I frameworks, leading to a compact and uniform perovskite film with large increase in the carrier lifetime. Meanwhile, the introduction of the π-conjugated systems also retards the permeation of moisture into perovskite crystal, which significantly suppresses the film degradation in air. These benefits contributed to a stabilizing power conversion efficiency (PCE) of 10.1% for the TPSCs and maintained over 90% of its initial PCE after 1000-h light soaking in air. Also, a steady-state efficiency of 9.2% was certified at the accredited test center.