High efficiency perovskite quantum dot solar cells with charge separating heterostructure

Qian Zhao, Abhijit Hazarika, Xihan Chen, Steve P. Harvey, Bryon W. Larson, Glenn R. Teeter, Jun Liu, Tao Song, Chuanxiao Xiao, Liam Shaw, Minghui Zhang, Guoran Li, Matthew C. Beard and Joseph M. Luther ()
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Qian Zhao: Nankai University
Abhijit Hazarika: National Renewable Energy Laboratory
Xihan Chen: National Renewable Energy Laboratory
Steve P. Harvey: National Renewable Energy Laboratory
Bryon W. Larson: National Renewable Energy Laboratory
Glenn R. Teeter: National Renewable Energy Laboratory
Jun Liu: National Renewable Energy Laboratory
Tao Song: National Renewable Energy Laboratory
Chuanxiao Xiao: National Renewable Energy Laboratory
Liam Shaw: Warren Wilson College
Minghui Zhang: Nankai University
Guoran Li: Nankai University
Matthew C. Beard: National Renewable Energy Laboratory
Joseph M. Luther: National Renewable Energy Laboratory

Nature Communications, 2019, vol. 10, issue 1, 1-8

Abstract: Abstract Metal halide perovskite semiconductors possess outstanding characteristics for optoelectronic applications including but not limited to photovoltaics. Low-dimensional and nanostructured motifs impart added functionality which can be exploited further. Moreover, wider cation composition tunability and tunable surface ligand properties of colloidal quantum dot (QD) perovskites now enable unprecedented device architectures which differ from thin-film perovskites fabricated from solvated molecular precursors. Here, using layer-by-layer deposition of perovskite QDs, we demonstrate solar cells with abrupt compositional changes throughout the perovskite film. We utilize this ability to abruptly control composition to create an internal heterojunction that facilitates charge separation at the internal interface leading to improved photocarrier harvesting. We show how the photovoltaic performance depends upon the heterojunction position, as well as the composition of each component, and we describe an architecture that greatly improves the performance of perovskite QD photovoltaics.

Date: 2019
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DOI: 10.1038/s41467-019-10856-z

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