High efficiency graded band gap perovskite solar cells

ORAL

Abstract

We report high efficiency graded band gap perovskite solar cells with very large current output and high power conversion efficiencies (PCE) by using simultaneously mixed halides (CH$_{\mathrm{3}}$NH$_{\mathrm{3}}$SnI3 and CH$_{\mathrm{3}}$NH$_{\mathrm{3}}$PbI$_{\mathrm{3}}$-$_{\mathrm{x}}$Br$_{\mathrm{x}})$ perovskite absorber layers. An analysis of the experimental data yields a high fill factor (FF) of \textasciitilde 75{\%} and high short circuit current density (J$_{\mathrm{sc}})$ of up to 46.2 mA/cm$^{\mathrm{2}}$. These devices provide the highest current output aiming above 20{\%} PCE.

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Authors

  • Onur Ergen

    University of California at Berkeley

  • Sally Demaio-turner

    University of California at Berkeley

  • Thang Pham

    University of California at Berkeley, Univ of California, Berkeley

  • Mark Tian Zhi Tan

    University of California at Berkeley

  • Jongmin Yuk

    University of California at Berkeley

  • Alex Zettl

    Dept. of Physics Univ. of California Berkeley, Lawrence Berkeley National Laboratory, Univ of California - Berkeley;Materials Sciences Division, LBNL;Kavli Energy NanoSciences Institute at the Univ of California, Berkeley and LBNL, UC Berkeley/Kavli ENSI/LBNL, University of California at Berkeley, Lawrence Berkeley National Laboratory; Univ of California, Berkeley, UCB Physics, LBNL MSD, and Kavli ENSI