Enhanced Charge Transport in 2D Perovskites via Fluorination of Organic Cation

Zhang, Fei; Kim, Dong Hoe; Lu, Haipeng; Park, Ji-Sang; Larson, Bryon W.; Hu, Jun; Gao, Liguo; Xiao, Chuanxiao; Reid, Obadiah G.; Chen, Xihan; Zhao, Qian; Ndione, Paul F.; Berry, Joseph J.; You, Wei; Walsh, Aron; Beard, Matthew C.; Zhu, Kai

doi:10.1021/jacs.9b00972

Enhanced Charge Transport in 2D Perovskites via Fluorination of Organic Cation

Journal Article · Mon Mar 18 00:00:00 EDT 2019 · Journal of the American Chemical Society

DOI:https://doi.org/10.1021/jacs.9b00972· OSTI ID:1506616

^[1]; Kim, Dong Hoe ^[1]; ^[1]; Park, Ji-Sang ^[2]; Larson, Bryon W. ^[1]; Hu, Jun ^[3]; ^[1]; Xiao, Chuanxiao ^[1]; Reid, Obadiah G. ^[4]; ^[1]; Zhao, Qian ^[1]; ^[1]; Berry, Joseph J. ^[1]; You, Wei ^[3]; ^[5]; ^[1]; ^[1]

National Renewable Energy Lab. (NREL), Golden, CO (United States)
Imperial College, London (United Kingdom)
Univ. of North Carolina, Chapel Hill, NC (United States)
National Renewable Energy Lab. (NREL), Golden, CO (United States); Univ. of Colorado, Boulder, CO (United States)
Imperial College, London (United Kingdom); Yonsei Univ., Seoul (Korea, Republic of)

Organic-inorganic halide perovskites incorporating two-dimensional (2D) structures have shown promise for enhancing the stability of perovskite solar cells (PSCs). However, the bulky spacer cations often limit charge transport. Here, we report on a simple approach based on molecular design of the organic spacer to improve the transport properties of 2D perovskites, and we use phenethylammonium (PEA) as an example. We demonstrate that by fluorine substitution on the para position in PEA to form 4-fluorophenethylammonium (F-PEA), the average phenyl ring centroid-centroid distances in the organic layer become shorter with better aligned stacking of perovskite sheets. The impact is enhanced orbital interactions and charge transport across adjacent inorganic layers as well as increased carrier lifetime and reduced trap density. Using a simple perovskite deposition at room temperature without using any additives, we obtained a power conversion efficiency of >13% for (F-PEA)₂MA₄Pb₅I₁₆-based PSCs. In addition, the thermal stability of 2D PSCs based on F-PEA is significantly enhanced compared to those based on PEA.

View Accepted Manuscript (DOE)

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

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Solar Energy Technologies Office (EE-4S); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC36-08GO28308

OSTI ID:: 1506616

Report Number(s):: NREL/JA--5900-73083

Journal Information:: Journal of the American Chemical Society, Journal Name: Journal of the American Chemical Society Journal Issue: 14 Vol. 141; ISSN 0002-7863

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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