Investigating Recombination and Charge Carrier Dynamics in a One-Dimensional Nanopillared Perovskite Absorber

Hyeok Chan Kwon, Wooseok Yang, Daehee Lee, Jihoon Ahn, Eunsong Lee, Sunihl Ma, Kyungmi Kim, Seong Cheol Yun, Jooho Moon

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Abstract

Organometal halide perovskite materials have become an exciting research topic as manifested by intense development of thin film solar cells. Although high-performance solar-cell-based planar and mesoscopic configurations have been reported, one-dimensional (1-D) nanostructured perovskite solar cells are rarely investigated despite their expected promising optoelectrical properties, such as enhanced charge transport/extraction. Herein, we have analyzed the 1-D nanostructure effects of organometal halide perovskite (CH3NH3PbI3-xClx) on recombination and charge carrier dynamics by utilizing a nanoporous anodized alumina oxide scaffold to fabricate a vertically aligned 1-D nanopillared array with controllable diameters. It was observed that the 1-D perovskite exhibits faster charge transport/extraction characteristics, lower defect density, and lower bulk resistance than the planar counterpart. As the aspect ratio increases in the 1-D structures, in addition, the charge transport/extraction rate is enhanced and the resistance further decreases. However, when the aspect ratio reaches 6.67 (diameter ~30 nm), the recombination rate is aggravated due to high interface-to-volume ratio-induced defect generation. To obtain the full benefits of 1-D perovskite nanostructuring, our study provides a design rule to choose the appropriate aspect ratio of 1-D perovskite structures for improved photovoltaic and other optoelectrical applications.

Original languageEnglish
Article number10.1021/acsnano.7b07559
Pages (from-to)4233−4245
Number of pages13
JournalACS Nano
Volume12
Issue number5
DOIs
Publication statusPublished - 2018 Apr 20

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)

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    Kwon, H. C., Yang, W., Lee, D., Ahn, J., Lee, E., Ma, S., Kim, K., Yun, S. C., & Moon, J. (2018). Investigating Recombination and Charge Carrier Dynamics in a One-Dimensional Nanopillared Perovskite Absorber. ACS Nano, 12(5), 4233−4245. [10.1021/acsnano.7b07559]. https://doi.org/10.1021/acsnano.7b07559