Resolving spatial and energetic distributions of trap states in metal halide perovskite solar cells
Resolving spatial and energetic distributions of trap states in metal halide perovskite solar cells
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DOI：
10.1126/science.aba0893
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发表时间：
2020-03-20
期刊：
影响因子：
56.9
通讯作者：
Huang, Jinsong
中科院分区：
文献类型：
--
作者：
Ni, Zhenyi;Bao, Chunxiong;Huang, Jinsong
我们报道了金属卤化物钙钛矿型单晶和多晶太阳电池中陷阱态的空间分布和能量分布。单晶中的陷阱密度变化了5个数量级，最低为2×10(11)/立方厘米，大部分深陷阱位于晶体表面。多晶薄膜界面所有深度的电荷陷阱密度都比薄膜内部的电荷陷阱密度大一到两个数量级，薄膜内部的陷阱密度仍然比高质量单晶的陷阱密度大两到三个数量级。令人惊讶的是，表面钝化后，大多数深陷阱出现在钙钛矿和空穴传输层的界面附近，那里嵌入了大量的纳米晶，限制了太阳能电池的效率。
We report the profiling of spatial and energetic distributions of trap states in metal halide perovskite single-crystalline and polycrystalline solar cells. The trap densities in single crystals varied by five orders of magnitude, with a lowest value of 2 x 10(11) per cubic centimeter and most of the deep traps located at crystal surfaces. The charge trap densities of all depths of the interfaces of the polycrystalline films were one to two orders of magnitude greater than that of the film interior, and the trap density at the film interior was still two to three orders of magnitude greater than that in high-quality single crystals. Suprisingly, after surface passivation, most deep traps were detected near the interface of perovskites and hole transport layers, where a large density of nanocrystals were embedded, limiting the efficiency of solar cells.