Highly Efficient 17.6% Tin-Lead Mixed Perovskite Solar Cells Realized through Spike Structure

Gaurav Kapil; Teresa S Ripolles; Kengo Hamada; Yuhei Ogomi; Takeru Bessho; Takumi Kinoshita; Jakapan Chantana; Kenji Yoshino; Qing Shen; Taro Toyoda; Takashi Minemoto; Takurou N Murakami; Hiroshi Segawa; Shuzi Hayase

doi:10.1021/acs.nanolett.8b00701

Highly Efficient 17.6% Tin-Lead Mixed Perovskite Solar Cells Realized through Spike Structure

Nano Lett. 2018 Jun 13;18(6):3600-3607. doi: 10.1021/acs.nanolett.8b00701. Epub 2018 May 1.

Authors

Affiliations

¹ Research Center for Advanced Science and Technology , The University of Tokyo , 4-6-1, Komaba , Meguro-ku, Tokyo 153-8904 , Japan.
² Graduate School of Life Science and Systems Engineering , Kyushu Institute of Technology , 2-4 Hibikino, Wakamatsu-ku , Kitakyushu 808-0196 Japan.
³ Department of Electrical and Electronic Engineering , Ritsumeikan University , 1-1-1 Nojihigashi , Kusatsu, Shiga 525-8577 , Japan.
⁴ Faculty of Engineering , University of Miyazaki , Gakuen-kibanadai-nishi-1-1 , Miyazaki , 889-2192 , Japan.
⁵ Graduate school of Informatics and Engineering , University of Electro-Communication , 1-5-1 Chofugaoka , Chofu, Tokyo , 182-8585 , Japan.
⁶ The National Institute of Advanced Industrial Science and Technology , 1-1-1 Higashi , Tsukuba, Ibaraki 305-8565 , Japan.

PMID: 29701473
DOI: 10.1021/acs.nanolett.8b00701

Abstract

Frequently observed high V_oc loss in tin-lead mixed perovskite solar cells is considered to be one of the serious bottle-necks in spite of the high attainable Jsc due to wide wavelength photon harvesting. An amicable solution to minimize the V_oc loss up to 0.50 V has been demonstrated by introducing an n-type interface with spike structure between the absorber and electron transport layer inspired by highly efficient Cu(In,Ga)Se₂ solar cells. Introduction of a conduction band offset of ∼0.15 eV with a thin phenyl-C61-butyric acid methyl ester layer (∼25 nm) on the top of perovskite absorber resulted into improved V_oc of 0.75 V leading to best power conversion efficiency of 17.6%. This enhancement is attributed to the facile charge flow at the interface owing to the reduction of interfacial traps and carrier recombination with spike structure as evidenced by time-resolved photoluminescence, nanosecond transient absorption, and electrochemical impedance spectroscopy measurements.

Keywords: Tin−lead mixed perovskite solar cells; high photocurrent; multication; spike structure; voltage loss.

Publication types

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