Tuning of the Interconnecting Layer for Monolithic Perovskite/Organic Tandem Solar Cells with Record Efficiency Exceeding 21

Pang Wang; Wei Li; Oskar J Sandberg; Chuanhang Guo; Rui Sun; Hui Wang; Donghui Li; Huijun Zhang; Shili Cheng; Dan Liu; Jie Min; Ardalan Armin; Tao Wang

doi:10.1021/acs.nanolett.1c02897

Tuning of the Interconnecting Layer for Monolithic Perovskite/Organic Tandem Solar Cells with Record Efficiency Exceeding 21

Nano Lett. 2021 Sep 22;21(18):7845-7854. doi: 10.1021/acs.nanolett.1c02897. Epub 2021 Sep 10.

Authors

Pang Wang^{1

2}, Wei Li³, Oskar J Sandberg³, Chuanhang Guo^{1

2}, Rui Sun⁴, Hui Wang^{1

2}, Donghui Li^{1

2}, Huijun Zhang^{1

2}, Shili Cheng^{1

2}, Dan Liu^{1

2}, Jie Min⁴, Ardalan Armin³, Tao Wang^{1

2}

Affiliations

¹ School of Materials Science and Engineering, Wuhan University of Technology, Wuhan, 430070, China.
² State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan, 430070, China.
³ Sustainable Advanced Materials (Sêr SAM), Department of Physics, Swansea University, Singleton Park, Swansea, Wales SA2 8PP, U.K.
⁴ The Institute for Advanced Studies, Wuhan University, Wuhan 430072, China.

PMID: 34505789
DOI: 10.1021/acs.nanolett.1c02897

Abstract

The photovoltaic performance of inorganic perovskite solar cells (PSCs) still lags behind the organic-inorganic hybrid PSCs due to limited light absorption of wide bandgap CsPbI_3-xBr_x under solar illumination. Constructing tandem devices with organic solar cells can effectively extend light absorption toward the long-wavelength region and reduce radiative photovoltage loss. Herein, we utilize wide-bandgap CsPbI₂Br semiconductor and narrow-bandgap PM6:Y6-BO blend to fabricate perovskite/organic tandem solar cells with an efficiency of 21.1% and a very small tandem open-circuit voltage loss of 0.06 V. We demonstrate that the hole transport material of the interconnecting layers plays a critical role in determining efficiency, with polyTPD being superior to PBDB-T-Si and D18 due to its low parasitic absorption, sufficient hole mobility and quasi-Ohmic contact to suppress charge accumulation and voltage loss within the tandem device. These perovskite/organic tandem devices also display superior storage, thermal and ultraviolet stabilities.

Keywords: efficiency; interconnecting layer; organic; perovskite; stability; tandem solar cell.