Orientational Order in Spin-Cast Lead-Iodide Perovskite Nanocrystal Solids

Vigil, Julian A.; Wieliczka, Brian M.; Larson, Bryon W.; Abdelsamie, Maged; Dutta, Nikita S.; Haque, Md Azimul; Hazarika, Abhijit; Luther, Joseph M.; Toney, Michael F.

doi:10.1021/acs.chemmater.3c01636

Orientational Order in Spin-Cast Lead-Iodide Perovskite Nanocrystal Solids

Journal Article · Thu Nov 16 23:00:00 EST 2023 · Chemistry of Materials

DOI:https://doi.org/10.1021/acs.chemmater.3c01636· OSTI ID:2274786

^[1]; ^[2]; ^[2]; Abdelsamie, Maged ^[3]; ^[2]; ^[2]; ^[2]; ^[4]; ^[5]

Stanford Univ., CA (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource (SSRL)
National Renewable Energy Laboratory (NREL), Golden, CO (United States)
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource (SSRL)
National Renewable Energy Laboratory (NREL), Golden, CO (United States); Renewable and Sustainable Energy Inst. (RASEI), Boulder, CO (United States)
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource (SSRL); Renewable and Sustainable Energy Inst. (RASEI), Boulder, CO (United States); Univ. of Colorado, Boulder, CO (United States)

Combined synthetic control over size and composition renders colloidal lead-halide perovskite nanocrystals a tunable platform for high-efficiency optoelectronic applications. However, the properties and operational stability of devices based on nanocrystal solids are often dictated by the method of the evaporation-induced assembly. Ubiquitous slow evaporation techniques can produce highly ordered nanocrystal domains but limit the prospects for scalable fabrication of continuous device layers, calling for investigation of approaches to more rapidly form ordered perovskite nanocrystal solids. Here, we study orientationally ordered lead-iodide perovskite nanocrystal solids prepared by conventional spin coating with molecular additives (excess ligand) to enhance ordering within the arrays. In situ X-ray scattering measurements reveal that orientational ordering occurs rapidly upon solvent removal during spin coating and can be further enhanced by manipulating the spin speed. We vary the additive ligand length and explore trade-offs between ordering and layered perovskite impurity formation. Arrays treated with the intermediate-length octylamine ligand exhibit increased in-plane electronic conductivity, suggesting orientational ordering and internanocrystal electronic coupling can be enhanced by the treatment. In conclusion, these results highlight the prospects of establishing long-range order in lead-halide perovskite nanocrystal solids by using simple and fast coating methods.

View Accepted Manuscript (DOE)

Research Organization:: National Renewable Energy Laboratory (NREL), Golden, CO (United States); Energy Frontier Research Centers (EFRC) (United States). Center for Hybrid Organic Inorganic Semiconductors for Energy (CHOISE)

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

Grant/Contract Number:: AC36-08GO28308; AC02-76SF00515

OSTI ID:: 2274786

Report Number(s):: NREL/JA--5900-84588; MainId:85361; UUID:3db66bb0-a0ae-4d89-8b03-635d13321ba4; MainAdminID:71323

Journal Information:: Chemistry of Materials, Journal Name: Chemistry of Materials Journal Issue: 23 Vol. 35; ISSN 0897-4756

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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Orientational Order in Spin-Cast Lead-Iodide Perovskite Nanocrystal Solids

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