In:
Science Advances, American Association for the Advancement of Science (AAAS), Vol. 3, No. 10 ( 2017-10-06)
Abstract:
We developed lead halide perovskite quantum dot (QD) films with tuned surface chemistry based on A-site cation halide salt (AX) treatments. QD perovskites offer colloidal synthesis and processing using industrially friendly solvents, which decouples grain growth from film deposition, and at present produce larger open-circuit voltages ( V OC ’s) than thin-film perovskites. CsPbI 3 QDs, with a tunable bandgap between 1.75 and 2.13 eV, are an ideal top cell candidate for all-perovskite multijunction solar cells because of their demonstrated small V OC deficit. We show that charge carrier mobility within perovskite QD films is dictated by the chemical conditions at the QD-QD junctions. The AX treatments provide a method for tuning the coupling between perovskite QDs, which is exploited for improved charge transport for fabricating high-quality QD films and devices. The AX treatments presented here double the film mobility, enabling increased photocurrent, and lead to a record certified QD solar cell efficiency of 13.43%.
Type of Medium:
Online Resource
ISSN:
2375-2548
DOI:
10.1126/sciadv.aao4204
Language:
English
Publisher:
American Association for the Advancement of Science (AAAS)
Publication Date:
2017
detail.hit.zdb_id:
2810933-8
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