Hot-Casting-Assisted Liquid Additive Engineering for Efficient and Stable Perovskite Solar Cells

Min, Hanul; Hu, Junnan; Xu, Zhaojian; Liu, Tianran; Khan, Saeed‐Uz‐Zaman; Roh, Kwangdong; Loo, Yueh‐Lin; Rand, Barry P.

doi:10.1002/adma.202205309

Title: Hot-Casting-Assisted Liquid Additive Engineering for Efficient and Stable Perovskite Solar Cells

Journal Article · 15 July 2022 · Advanced Materials

DOI: https://doi.org/10.1002/adma.202205309 · OSTI ID:1976219

Min, Hanul ^[1]; Hu, Junnan ^[2]; Xu, Zhaojian ^[2]; Liu, Tianran ^[2]; Khan, Saeed‐Uz‐Zaman ^[2]; Roh, Kwangdong ^[3]; Loo, Yueh‐Lin ^[2];

^[2]

Princeton University, NJ (United States); OSTI
Princeton University, NJ (United States)
Princeton University, NJ (United States); Ewha Womans University, Seoul (Korea, Republic of)

High-performance inorganic–organic lead halide perovskite solar cells (PSCs) are often fabricated with a liquid additive such as dimethyl sulfoxide (DMSO), which retards crystallization and reduces roughness and pinholes in the perovskite layers. However, DMSO can be trapped during perovskite film formation and induce voids and undesired reaction byproducts upon later processing steps. Here, it is shown that the amount of residual DMSO can be reduced in as-spin-coated films significantly through use of preheated substrates, or a so-called hot-casting method. Hot casting increases the perovskite film thickness given the same concentration of solutions, which allows for reducing the perovskite solution concentration. By reducing the amount of DMSO in proportion to the concentration of perovskite precursors and using hot casting, it is possible to fabricate perovskite layers with improved perovskite–substrate interfaces by suppressing the formation of byproducts, which increase trap density and accelerate degradation of the perovskite layers. The best-performing PSCs exhibit a power conversion efficiency (PCE) of 23.4% (23.0% stabilized efficiency) under simulated solar illumination. Furthermore, encapsulated devices show considerably reduced post-burn-in decay, retaining 75% and 90% of their initial and post-burn-in efficiencies after 3000 h of operation with maximum power point tracking (MPPT) under high power of ultraviolet (UV)-containing continuous light exposure.

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Research Organization:: Princeton University, NJ (United States)

Sponsoring Organization:: National Science Foundation (NSF); Office of Naval Research (ONR); USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Solar Energy Technologies Office

Grant/Contract Number:: EE0008560

OSTI ID:: 1976219

Journal Information:: Advanced Materials, Journal Name: Advanced Materials Journal Issue: 36 Vol. 34; ISSN 0935-9648

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
UV-stability
dimethyl sulfoxide
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liquid additive
perovskite solar cells

Title: Hot-Casting-Assisted Liquid Additive Engineering for Efficient and Stable Perovskite Solar Cells

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