Effects of Hydroiodic Acid Concentration on the Properties of CsPbI3 Perovskite Solar Cells

Faiazul Haque; Matthew Wright; Md Arafat Mahmud; Haimang Yi; Dian Wang; Leiping Duan; Cheng Xu; Mushfika Baishakhi Upama; Ashraf Uddin

doi:10.1021/acsomega.8b01589

Effects of Hydroiodic Acid Concentration on the Properties of CsPbI₃ Perovskite Solar Cells

ACS Omega. 2018 Sep 26;3(9):11937-11944. doi: 10.1021/acsomega.8b01589. eCollection 2018 Sep 30.

Authors

Faiazul Haque¹, Matthew Wright¹, Md Arafat Mahmud¹, Haimang Yi¹, Dian Wang¹, Leiping Duan¹, Cheng Xu¹, Mushfika Baishakhi Upama¹, Ashraf Uddin¹

Affiliation

¹ School of Photovoltaic and Renewable Energy Engineering, University of New South Wales, 2052 Sydney, Australia.

Abstract

Inorganic cesium lead triiodide (CsPbI₃) perovskite materials are becoming increasingly attractive for use in perovskite/silicon tandem solar cells, due to their almost ideal band gap energy (E _g) of about 1.7 eV. To be useful as photovoltaic absorbers, the CsPbI₃ must form the cubic or black phase (α-CsPbI₃). To do so at relatively low temperatures, hydroiodic acid (HI) is required as a solution additive. This paper demonstrates CsPbI₃ perovskite solar cells with an efficiency of 6.44%, formed using a HI concentration of 36 μL/mL. This value is higher than the previous most commonly used HI additive concentration. Herein, by undertaking a systematic study of the HI concentration, we demonstrate that the structural, morphological, optical, and electrical properties of CsPbI₃ solar cells, processed with this HI additive concentration, are superior.