Phenethylammonium Functionalization Enhances Near-Surface Carrier Diffusion in Hybrid Perovskites

Wang, Ti; Fu, Yongping; Jin, Linrui; Deng, Shibin; Pan, Dongxu; Dong, Liang; Jin, Song; Huang, Libai

doi:10.1021/jacs.0c04377

Phenethylammonium Functionalization Enhances Near-Surface Carrier Diffusion in Hybrid Perovskites

Journal Article · Wed Aug 26 00:00:00 EDT 2020 · Journal of the American Chemical Society

DOI:https://doi.org/10.1021/jacs.0c04377· OSTI ID:1657802

Wang, Ti ^[1]; Fu, Yongping ^[2]; Jin, Linrui ^[3]; Deng, Shibin ^[3]; Pan, Dongxu ^[2]; Dong, Liang ^[4]; Jin, Song ^[2]; Huang, Libai ^[3]

Purdue Univ., West Lafayette, IN (United States); Wuhan Univ. (China); Purdue University
Univ. of Wisconsin, Madison, WI (United States)
Purdue Univ., West Lafayette, IN (United States)
Wuhan Univ. (China)

Understanding semiconductor surface properties and manipulating them chemically are critical for improving their performance in optoelectronic devices. Hybrid halide perovskites have emerged as an exciting class of highly efficient solar materials; however, their device performance could be limited by undesirable surface properties that impede carrier transport and induce recombination. Here we show that surface functionalization of methylammonium lead iodide (MAPbI₃) perovskite with phenethylammonium iodide (PEAI), a commonly employed spacer cation in two-dimensional perovskites, can enhance carrier diffusion in the near-surface regions and reduce defect density by more than one order of magnitude. Using transient transmission and reflection microscopy, we selectively imaged the transport of the carriers near the (001) surface and the bulk carriers in single-crystal MAPbI₃ microplates. The surface functionalization increases the diffusion coefficient of the carriers in a 40-nm subsurface region from ~ 0.6 cm²s^-1 to ~ 1 cm²s^-1, similar to the value for bulk carriers. These results suggest the PEA ligands are effective in suppressing surface defect and phonon scattering and shed light on the mechanisms for enhancing photophysical properties and improving solar cell efficiency.

View Accepted Manuscript (DOE)

Research Organization:: Purdue Univ., West Lafayette, IN (United States)

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

Grant/Contract Number:: SC0016356

OSTI ID:: 1657802

Journal Information:: Journal of the American Chemical Society, Journal Name: Journal of the American Chemical Society Journal Issue: 38 Vol. 142; ISSN 0002-7863

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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