Energy level tuned indium arsenide colloidal quantum dot films for efficient photovoltaics.

Author(s) Song, J.Hoon; Choi, H.; Pham, H.Thu; Jeong, S.
Journal Nat Commun
Date Published 2018 10 15

We introduce indium arsenide colloidal quantum dot films for photovoltaic devices, fabricated by two-step surface modification. Native ligands and unwanted oxides on the surface are peeled off followed by passivating with incoming atomic or short ligands. The near-infrared-absorbing n-type indium arsenide colloidal quantum dot films can be tuned in energy-level positions up to 0.4 eV depending on the surface chemistry, and consequently, they boost collection efficiency when used in various emerging solar cells. As an example, we demonstrate p-n junction between n-type indium arsenide and p-type lead sulfide colloidal quantum dot layers, which leads to a favorable electronic band alignment and charge extraction from both colloidal quantum dot layers. A certified power conversion efficiency of 7.92% is achieved without additionally supporting carrier transport layers. This study provides richer materials to explore for high-efficiency emerging photovoltaics and will broaden research interest for various optoelectronic applications using the n-type covalent nanocrystal arrays.

DOI 10.1038/s41467-018-06399-4
ISSN 2041-1723
Citation Nat Commun. 2018;9(1):4267.

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