Cesium Lead Halide Perovskites with Improved Stability for Tandem Solar Cells
Cesium Lead Halide Perovskites with Improved Stability for Tandem Solar Cells
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DOI：
10.1021/acs.jpclett.6b00002
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发表时间：
2016-03-03
影响因子：
5.7
通讯作者：
McGehee, Michael D.
中科院分区：
文献类型：
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作者：
Beal, Rachel E.;Slotcavage, Daniel J.;McGehee, Michael D.
可以大规模加工的带隙约为1.8 eV的半导体可以在晶体Si上制造高效低成本的双结太阳能电池。可溶液加工的有机-无机卤化物钙钛矿最近作为单结太阳能电池中的吸收剂产生了相当大的兴奋，并且尽管可以通过控制卤化物浓度将（CH 3 NH 3）Pb（BrxI 1x）（3）的带隙调节在2.3和1.6 eV之间，由于光致相分离引起的光学不稳定性限制了可以从具有适当带隙的组合物中提取的电压应用.此外，这些材料已被证明在加工和操作窗口内的温度下会发生热降解。通过用铯代替挥发性甲基铵阳离子，可以合成具有改善的光学和热稳定性、6.5%的稳定的光转换效率和1.9eV的带隙的混合卤化物吸收剂材料。
A semiconductor that can be processed on a large scale with a bandgap around 1.8 eV could enable the manufacture of highly efficient low cost double-junction solar cells on crystalline Si. Solution-processable organicinorganic halide perovskites have recently generated considerable excitement as absorbers in single-junction solar cells, and though it is possible to tune the bandgap of (CH3NH3)Pb(BrxI1x)(3) between 2.3 and 1.6 eV by controlling the halide concentration, optical instability due to photoinduced phase segregation limits the voltage that can be extracted from compositions with appropriate bandgaps for tandem applications. Moreover, these materials have been shown to suffer from thermal degradation at temperatures within the processing and operational window. By replacing the volatile methylammonium cation with cesium, it is possible to synthesize a mixed halide absorber material with improved optical and thermal stability, a stabilized photoconversion efficiency of 6.5%, and a bandgap of 1.9 eV.