Fabrication of Efficient Low-Bandgap Perovskite Solar Cells by Combining Formamidinium Tin Iodide with Methylammonium Lead Iodide

Weiqiang Liao; Dewei Zhao; Yue Yu; Niraj Shrestha; Kiran Ghimire; Corey R Grice; Changlei Wang; Yuqing Xiao; Alexander J Cimaroli; Randy J Ellingson; Nikolas J Podraza; Kai Zhu; Ren-Gen Xiong; Yanfa Yan

doi:10.1021/jacs.6b08337

Fabrication of Efficient Low-Bandgap Perovskite Solar Cells by Combining Formamidinium Tin Iodide with Methylammonium Lead Iodide

J Am Chem Soc. 2016 Sep 28;138(38):12360-3. doi: 10.1021/jacs.6b08337. Epub 2016 Sep 19.

Authors

Weiqiang Liao^{1

2}, Dewei Zhao¹, Yue Yu¹, Niraj Shrestha¹, Kiran Ghimire¹, Corey R Grice¹, Changlei Wang^{1

3}, Yuqing Xiao³, Alexander J Cimaroli¹, Randy J Ellingson¹, Nikolas J Podraza¹, Kai Zhu⁴, Ren-Gen Xiong², Yanfa Yan¹

Affiliations

¹ Department of Physics and Astronomy and Wright Center for Photovoltaics Innovation and Commercialization, The University of Toledo , Toledo, Ohio 43606, United States.
² Ordered Matter Science Research Center, Southeast University , Nanjing 211189, China.
³ Key Laboratory of Artificial Micro/Nano Structures of Ministry of Education, School of Physics and Technology, Wuhan University , Wuhan 430072, China.
⁴ Chemistry and Nanoscience Center, National Renewable Energy Laboratory , Golden, Colorado 80401, United States.

PMID: 27622903
DOI: 10.1021/jacs.6b08337

Abstract

Mixed tin (Sn)-lead (Pb) perovskites with high Sn content exhibit low bandgaps suitable for fabricating the bottom cell of perovskite-based tandem solar cells. In this work, we report on the fabrication of efficient mixed Sn-Pb perovskite solar cells using precursors combining formamidinium tin iodide (FASnI3) and methylammonium lead iodide (MAPbI3). The best-performing cell fabricated using a (FASnI3)0.6(MAPbI3)0.4 absorber with an absorption edge of ∼1.2 eV achieved a power conversion efficiency (PCE) of 15.08 (15.00)% with an open-circuit voltage of 0.795 (0.799) V, a short-circuit current density of 26.86(26.82) mA/cm(2), and a fill factor of 70.6(70.0)% when measured under forward (reverse) voltage scan. The average PCE of 50 cells we have fabricated is 14.39 ± 0.33%, indicating good reproducibility.

Publication types

Research Support, U.S. Gov't, Non-P.H.S.
Research Support, Non-U.S. Gov't