Stabilized Wide Bandgap Perovskite Solar Cells by Tin Substitution

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review

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Author(s)

  • Zhibin Yang
  • Adharsh Rajagopal
  • Sae Byeok Jo
  • Chu-Chen Chueh
  • Spencer Williams
  • Chun-Chih Huang
  • John K. Katahara
  • Hugh W. Hillhouse

Detail(s)

Original languageEnglish
Pages (from-to)7739-7747
Journal / PublicationNano Letters
Volume16
Issue number12
Publication statusPublished - 14 Dec 2016
Externally publishedYes

Abstract

Wide bandgap MAPb(I1-yBry)3 perovskites show promising potential for application in tandem solar cells. However, unstable photovoltaic performance caused by phase segregation has been observed under illumination when y is above 0.2. Herein, we successfully demonstrate stabilization of the I/Br phase by partially replacing Pb2+ with Sn2+ and verify this stabilization with X-ray diffractometry and transient absorption spectroscopy. The resulting MAPb0.75Sn0.25(I1-yBry)3 perovskite solar cells show stable photovoltaic performance under continuous illumination. Among these cells, the one based on MAPb0.75Sn0.25(I0.4Br0.6)3 perovskite shows the highest efficiency of 12.59% with a bandgap of 1.73 eV, which make it a promising wide bandgap candidate for application in tandem solar cells. The engineering of internal bonding environment by partial Sn substitution is believed to be the main reason for making MAPb0.75Sn0.25(I1-yBry)3 perovskite less vulnerable to phase segregation during the photostriction under illumination. Therefore, this study establishes composition engineering of the metal site as a promising strategy to impart phase stability in hybrid perovskites under illumination.

Research Area(s)

  • Large bandgap, phase segregation, photo stability, Sn substitution

Citation Format(s)

Stabilized Wide Bandgap Perovskite Solar Cells by Tin Substitution. / Yang, Zhibin; Rajagopal, Adharsh; Jo, Sae Byeok; Chueh, Chu-Chen; Williams, Spencer; Huang, Chun-Chih; Katahara, John K.; Hillhouse, Hugh W.; Jen, Alex K.-Y.

In: Nano Letters, Vol. 16, No. 12, 14.12.2016, p. 7739-7747.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review