Photovoltaic Performance of Vapor-Assisted Solution-Processed Layer Polymorph of Cs3Sb2I9

Anupriya Singh; Karunakara Moorthy Boopathi; Anisha Mohapatra; Yang Fang Chen; Gang Li; Chih Wei Chu

doi:10.1021/acsami.7b16349

Photovoltaic Performance of Vapor-Assisted Solution-Processed Layer Polymorph of Cs₃Sb₂I₉

ACS Appl Mater Interfaces. 2018 Jan 24;10(3):2566-2573. doi: 10.1021/acsami.7b16349. Epub 2018 Jan 11.

Authors

Anupriya Singh^{1

2

3}, Karunakara Moorthy Boopathi¹, Anisha Mohapatra¹, Yang Fang Chen^{2

3}, Gang Li⁴, Chih Wei Chu^{1

3

5

6}

Affiliations

¹ Research Center for Applied Science, Academia Sinica , Taipei 115, Taiwan.
² Department of Physics, National Taiwan University , Sec. 4, Roosevelt Road, Taipei 106, Taiwan.
³ Nano Science and Technology, Taiwan International Graduate Program, Academia Sinica and National Taiwan University , Taipei 115, Taiwan.
⁴ Department of Electronic and Information Engineering, The Hong Kong Polytechnic University , Hung Hom, Kowloon, Hong Kong, China.
⁵ College of Engineering, Chang Gung University , Taoyuan City 333, Taiwan.
⁶ Department of Materials Science and Engineering, National Tsing Hua University , Hsinchu 30013, Taiwan.

PMID: 29281245
DOI: 10.1021/acsami.7b16349

Abstract

The presence of toxic lead (Pb) remains a major obstruction to the commercial application of perovskite solar cells. Although antimony (Sb)-based perovskite-like structures A₃M₂X₉ can display potentially useful photovoltaic behavior, solution-processed Sb-based perovskite-like structures usually favor the dimer phase, which has poor photovoltaic properties. In this study, we prepared a layered polymorph of Cs₃Sb₂I₉ through solution-processing and studied its photovoltaic properties. The exciton binding energy and exciton lifetime of the layer-form Cs₃Sb₂I₉ were approximately 100 meV and 6 ns, respectively. The photovoltaic properties of the layered polymorph were superior to those of the dimer polymorph. A solar cell incorporating the layer-form Cs₃Sb₂I₉ exhibited an open-circuit voltage of 0.72 V and a power conversion efficiency of 1.5%-the highest reported for an all-inorganic Sb-based perovskite.

Keywords: all-inorganic; antimony based; lead-free; perovskite solar cells; solution processed.