Intermediate-phase engineering via dimethylammonium cation additive for stable perovskite solar cells

McMeekin, David P.; Holzhey, Philippe; Fürer, Sebastian O.; Harvey, Steven P.; Schelhas, Laura T.; Ball, James M.; Mahesh, Suhas; Seo, Seongrok; Hawkins, Nicholas; Lu, Jianfeng; Johnston, Michael B.; Berry, Joseph J.; Bach, Udo; Snaith, Henry J.

doi:10.1038/s41563-022-01399-8

Intermediate-phase engineering via dimethylammonium cation additive for stable perovskite solar cells

Journal Article · Wed Nov 30 23:00:00 EST 2022 · Nature Materials

DOI:https://doi.org/10.1038/s41563-022-01399-8· OSTI ID:1906196

^[1]; ^[2]; ^[3]; ^[4]; ^[5]; Ball, James M. ^[2]; Mahesh, Suhas ^[2]; Seo, Seongrok ^[2]; Hawkins, Nicholas ^[2]; ^[3]; ^[2]; ^[4]; ^[3]; ^[2]

Univ. of Oxford (United Kingdom); Monash Univ., Clayton, VIC (Australia)
Univ. of Oxford (United Kingdom)
Monash Univ., Clayton, VIC (Australia)
National Renewable Energy Lab. (NREL), Golden, CO (United States)
SLAC National Accelerator Lab., Menlo Park, CA (United States); National Renewable Energy Lab. (NREL), Golden, CO (United States)

Achieving the long-term stability of perovskite solar cells is arguably the most important challenge required to enable widespread commercialization. Understanding the perovskite crystallization process and its direct impact on device stability is critical to achieving this goal. The commonly employed dimethyl-formamide/dimethyl-sulfoxide solvent preparation method results in a poor crystal quality and microstructure of the polycrystalline perovskite films. In this work, we introduce a high-temperature dimethyl-sulfoxide-free processing method that utilizes dimethylammonium chloride as an additive to control the perovskite intermediate precursor phases. By controlling the crystallization sequence, we tune the grain size, texturing, orientation (corner-up versus face-up) and crystallinity of the formamidinium (FA)/caesium (FA)_yCs_1-yPb(I_xBr_1-x)3 perovskite system. A population of encapsulated devices showed improved operational stability, with a median T80 lifetime (the time over which the device power conversion efficiency decreases to 80% of its initial value) for the steady-state power conversion efficiency of 1,190 hours, and a champion device showed a T80 of 1,410 hours, under simulated sunlight at 65 degrees C in air, under open-circuit conditions. In conclusion, this work highlights the importance of material quality in achieving the long-term operational stability of perovskite optoelectronic devices.

View Accepted Manuscript (DOE)

Research Organization:: National Renewable Energy Laboratory (NREL), Golden, CO (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Solar Energy Technologies Office; European Union (EU); Engineering and Physical Sciences Research Council (UK); Australian Research Council; Australian Centre for Advanced Photovoltaics; Australian Renewable Energy Agency; US Department of the Navy, Office of Naval Research (ONR); USDOE Office of Science (SC), Basic Energy Sciences (BES)

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

OSTI ID:: 1906196

Report Number(s):: NREL/JA-5K00-83873; MainId:84646; UUID:8dd5c155-1eef-423b-aaec-baa8fb623ee0; MainAdminID:67985

Journal Information:: Nature Materials, Journal Name: Nature Materials Journal Issue: 1 Vol. 22; ISSN 1476-1122

Publisher:: Springer NatureCopyright Statement

Country of Publication:: United States

Language:: English

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