Optical and Electronic Losses Arising from Physically Mixed Interfacial Layers in Perovskite Solar Cells

Subedi, Biwas; Song, Zhaoning; Chen, Cong; Li, Chongwen; Ghimire, Kiran; Junda, Maxwell M.; Subedi, Indra; Yan, Yanfa; Podraza, Nikolas J.

doi:10.1021/acsami.0c16364

Optical and Electronic Losses Arising from Physically Mixed Interfacial Layers in Perovskite Solar Cells

Journal Article · Wed Jan 20 00:00:00 EST 2021 · ACS Applied Materials and Interfaces

DOI:https://doi.org/10.1021/acsami.0c16364· OSTI ID:2478159

^[1]; ^[1]; ^[1]; Li, Chongwen ^[1]; Ghimire, Kiran ^[1]; ^[1]; Subedi, Indra ^[1]; ^[1]; Podraza, Nikolas J. ^[1]

University of Toledo, OH (United States)

Perovskite solar cell device performance is affected by optical and electronic losses. To minimize these losses in solar cells, it is important to identify their sources. Here, we report the optical and electronic losses arising from physically mixed interfacial layers between the adjacent component materials in highly efficient two terminal (2T) all-perovskite tandem, single junction wide-bandgap, and single junction narrow-bandgap perovskite-based solar cells. Physically mixed interfacial layers as the sources of optical and electronic losses are identified from spectroscopic ellipsometry measurements and data analysis followed by comparisons of simulated and measured external quantum efficiency spectra. Parasitic absorbance in the physically mixed regions between silver metal electrical contacts and electron transport layers (ETLs) near the back contact and a physical mixture of commercial indium tin oxide and hole transport layers (HTL) near the front electrical contact lead to substantial optical loss. Here, a lower-density void + perovskite nucleation layer formed during perovskite deposition at the interface between the perovskite absorber layer and the HTL causes electronic losses due to incomplete collection of photogenerated carriers likely originating from poor coverage and passivation of the initially nucleating grains.

View Accepted Manuscript (DOE)

Research Organization:: University of Toledo, OH (United States)

Sponsoring Organization:: Air Force Research Laboratory; Northwest Ohio Innovators in Thin Film Photovoltaics; USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Solar Energy Technologies Office

Grant/Contract Number:: EE0008753

OSTI ID:: 2478159

Alternate ID(s):: OSTI ID: 1848869

Journal Information:: ACS Applied Materials and Interfaces, Journal Name: ACS Applied Materials and Interfaces Journal Issue: 4 Vol. 13; ISSN 1944-8244

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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Optical and Electronic Losses Arising from Physically Mixed Interfacial Layers in Perovskite Solar Cells

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