Enhanced mobility CsPbI3 quantum dot arrays for record-efficiency, high-voltage photovoltaic cells
Autor: | Joseph M. Luther, Steven P. Harvey, Peter N. Ciesielski, Lance M. Wheeler, Erin M. Sanehira, Lih Y. Lin, Philip Schulz, Ashley R. Marshall, Jeffrey A. Christians, Matthew C. Beard |
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Jazyk: | angličtina |
Rok vydání: | 2017 |
Předmět: |
Photocurrent
Multidisciplinary Band gap Photovoltaic system Halide Nanotechnology 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Grain growth Solar cell efficiency Quantum dot 0210 nano-technology Perovskite (structure) |
Zdroj: | Science Advances. 3(10) |
ISSN: | 2375-2548 |
Popis: | 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 (VOC’s) than thin-film perovskites. CsPbI3 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 VOC 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%. |
Databáze: | OpenAIRE |
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