CsPbBr 3 Solar Cells: Controlled Film Growth through Layer-by-Layer Quantum Dot Deposition

Hoffman, Jacob B.; Zaiats, Gary; Wappes, Isaac; Kamat, Prashant V.

doi:10.1021/acs.chemmater.7b03751

Title: CsPbBr ₃ Solar Cells: Controlled Film Growth through Layer-by-Layer Quantum Dot Deposition

Journal Article · Thu Nov 09 00:00:00 EST 2017 · Chemistry of Materials

DOI:https://doi.org/10.1021/acs.chemmater.7b03751· OSTI ID:1408150

Hoffman, Jacob B. ^[1]; Zaiats, Gary ^[1]; Wappes, Isaac ^[1];

^[1]

Radiation Laboratory, ‡Department of Chemistry & Biochemistry, and §Department of Chemical and Biomolecular Engineering, University of Notre Dame, Notre Dame, Indiana 46556, United States

All inorganic cesium lead bromide (CsPbBr₃) perovskite is a more stable alternative to methylammonium lead bromide (MAPbBr₃) for designing high open-circuit voltage solar cells and display devices. Poor solubility of CsBr in organic solvents makes typical solution deposition methods difficult to adapt for constructing CsPbBr₃ devices. Our layer-by-layer methodology, which makes use of CsPbBr₃ quantum dot (QD) deposition followed by annealing, provides a convenient way to cast stable films of desired thickness. The transformation from QDs into bulk during thermal annealing arises from the resumption of nanoparticle growth and not from sintering as generally assumed. Additionally, a large loss of organic material during the annealing process is mainly from 1-octadecene left during the QD synthesis. Utilizing this deposition approach for perovskite photovoltaics is examined using typical planar architecture devices. Devices optimized to both QD spin-casting concentration and overall CsPbBr₃ thickness produce champion devices that reach power conversion efficiencies of 5.5% with a V_oc value of 1.4 V. Finally, the layered QD deposition demonstrates a controlled perovskite film architecture for developing efficient, high open-circuit photovoltaic devices.

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Research Organization:: Univ. of Notre Dame, IN (United States). Radiation Laboratory

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: FC02-04ER15533

OSTI ID:: 1408150

Alternate ID(s):: OSTI ID: 1413252

Journal Information:: Chemistry of Materials, Journal Name: Chemistry of Materials Vol. 29 Journal Issue: 22; ISSN 0897-4756

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 133 works

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Title: CsPbBr 3 Solar Cells: Controlled Film Growth through Layer-by-Layer Quantum Dot Deposition

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Title: CsPbBr ₃ Solar Cells: Controlled Film Growth through Layer-by-Layer Quantum Dot Deposition