Dopant-Free Hole Transport Materials Afford Efficient and Stable Inorganic Perovskite Solar Cells and Modules

Cheng Liu; Cansu Igci; Yi Yang; Olga A Syzgantseva; Maria A Syzgantseva; Kasparas Rakstys; Hiroyuki Kanda; Naoyuki Shibayama; Bin Ding; Xianfu Zhang; Vygintas Jankauskas; Yong Ding; Songyuan Dai; Paul J Dyson; Mohammad Khaja Nazeeruddin

doi:10.1002/anie.202107774

Dopant-Free Hole Transport Materials Afford Efficient and Stable Inorganic Perovskite Solar Cells and Modules

Angew Chem Int Ed Engl. 2021 Sep 6;60(37):20489-20497. doi: 10.1002/anie.202107774. Epub 2021 Aug 7.

Authors

Cheng Liu^{1

2}, Cansu Igci², Yi Yang^{1

2}, Olga A Syzgantseva³, Maria A Syzgantseva³, Kasparas Rakstys⁴, Hiroyuki Kanda², Naoyuki Shibayama⁵, Bin Ding², Xianfu Zhang¹, Vygintas Jankauskas^{4

6}, Yong Ding^{1

2}, Songyuan Dai¹, Paul J Dyson², Mohammad Khaja Nazeeruddin^{2

7}

Affiliations

¹ State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing, 102206, P. R. China.
² Group for Molecular Engineering of Functional Materials, Institute of Chemical Sciences and Engineering, EPFL VALAIS, 1951, Sion, Switzerland.
³ Department of Chemistry, Lomonosov Moscow State University, Moscow, 119991, Russia.
⁴ Department of Organic Chemistry, Kaunas University of Technology, Kaunas, 50254, Lithuania.
⁵ Department of Biomedical Engineering, Toin University of Yokohama, 1614 Kurogane, Aoba, Yokohama, Japan.
⁶ Institute of Chemical Physics, Vilnius University, Sauletekio al. 3, Vilnius, 10257, Lithuania.
⁷ Department of Materials Science and Engineering, City University of Hong Kong, Kowloon, Hong Kong.

Abstract

The emerging CsPbI₃ perovskites are highly efficient and thermally stable materials for wide-band gap perovskite solar cells (PSCs), but the doped hole transport materials (HTMs) accelerate the undesirable phase transition of CsPbI₃ in ambient. Herein, a dopant-free D-π-A type HTM named CI-TTIN-2F has been developed which overcomes this problem. The suitable optoelectronic properties and energy-level alignment endow CI-TTIN-2F with excellent charge collection properties. Moreover, CI-TTIN-2F provides multisite defect-healing effects on the defective sites of CsPbI₃ surface. Inorganic CsPbI₃ PSCs with CI-TTIN-2F HTM feature high efficiencies up to 15.9 %, along with 86 % efficiency retention after 1000 h under ambient conditions. Inorganic perovskite solar modules were also fabricated that exhibiting an efficiency of 11.0 % with a record area of 27 cm² . This work confirms that using efficient dopant-free HTMs is an attractive strategy to stabilize inorganic PSCs for their future scale-up.

Keywords: defect passivation; dopant-free; hole transport materials; inorganic perovskites; perovskite solar cells.

Abstract

Grants and funding