Thin single crystal perovskite solar cells to harvest below-bandgap light absorption

Zhaolai Chen, Qingfeng Dong, Ye Liu, Chunxiong Bao, Yanjun Fang, Yun Lin, Shi Tang, Qi Wang, Xun Xiao, Yang Bai, Yehao Deng and Jinsong Huang ()
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Zhaolai Chen: University of Nebraska
Qingfeng Dong: University of Nebraska
Ye Liu: University of Nebraska
Chunxiong Bao: University of Nebraska
Yanjun Fang: University of Nebraska
Yun Lin: University of Nebraska
Shi Tang: University of Nebraska
Qi Wang: University of Nebraska
Xun Xiao: University of Nebraska
Yang Bai: University of Nebraska
Yehao Deng: University of Nebraska
Jinsong Huang: University of Nebraska

Nature Communications, 2017, vol. 8, issue 1, 1-7

Abstract: Abstract The efficiency of perovskite solar cells has surged in the past few years, while the bandgaps of current perovskite materials for record efficiencies are much larger than the optimal value, which makes the efficiency far lower than the Shockley–Queisser efficiency limit. Here we show that utilizing the below-bandgap absorption of perovskite single crystals can narrow down their effective optical bandgap without changing the composition. Thin methylammonium lead triiodide single crystals with tuned thickness of tens of micrometers are directly grown on hole-transport-layer covered substrates by a hydrophobic interface confined lateral crystal growth method. The spectral response of the methylammonium lead triiodide single crystal solar cells is extended to 820 nm, 20 nm broader than the corresponding polycrystalline thin-film solar cells. The open-circuit voltage and fill factor are not sacrificed, resulting in an efficiency of 17.8% for single crystal perovskite solar cells.

Date: 2017
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DOI: 10.1038/s41467-017-02039-5

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