Efficient and Stable Perovskite Solar Cells with a High Open-Circuit Voltage Over 1.2 V Achieved by a Dual-Side Passivation Layer

Ju-Hyeon Kim; Yong Ryun Kim; Juae Kim; Chang-Mok Oh; In-Wook Hwang; Jehan Kim; Stefan Zeiske; Taeyoon Ki; Sooncheol Kwon; Heejoo Kim; Ardalan Armin; Hongsuk Suh; Kwanghee Lee

doi:10.1002/adma.202205268

Efficient and Stable Perovskite Solar Cells with a High Open-Circuit Voltage Over 1.2 V Achieved by a Dual-Side Passivation Layer

Adv Mater. 2022 Oct;34(41):e2205268. doi: 10.1002/adma.202205268. Epub 2022 Sep 11.

Authors

Ju-Hyeon Kim^{1

2}, Yong Ryun Kim³, Juae Kim⁴, Chang-Mok Oh⁵, In-Wook Hwang⁵, Jehan Kim⁶, Stefan Zeiske³, Taeyoon Ki^{1

2}, Sooncheol Kwon⁷, Heejoo Kim^{2

8}, Ardalan Armin³, Hongsuk Suh⁴, Kwanghee Lee^{1

2}

Affiliations

¹ School of Materials Science and Engineering, Gwangju Institute of Science and Technology (GIST), Gwangju, 61005, Republic of Korea.
² Heeger Center for Advanced Materials (HCAM) and Research Institute for Solar and Sustainable Energies (RISE), Gwangju Institute of Science and Technology (GIST), Gwangju, 61005, Republic of Korea.
³ Sustainable Advanced Materials (Sêr-SAM), Department of Physics, Swansea University, Singleton Park, Swansea, SA2 8PP, UK.
⁴ Department of Chemistry and Chemistry Institute for Functional Materials, Pusan National University (PNU), Busan, 46241, Republic of Korea.
⁵ Advanced Photonics Research Institute, Gwangju Institute of Science and Technology (GIST), Gwangju, 61005, Republic of Korea.
⁶ Pohang Accelerator Laboratory, Pohang University of Science and Technology, Pohang, 37673, Republic of Korea.
⁷ Department of Energy and Materials Engineering, Dongguk University, Seoul, 04620, Republic of Korea.
⁸ Graduate School of Energy Convergence, Institute of Integrated Technology, Gwangju Institute of Science and Technology (GIST), Gwangju, 61005, Republic of Korea.

PMID: 36030364
DOI: 10.1002/adma.202205268

Abstract

Suppressing nonradiative recombination at the interface between the organometal halide perovskite (PVK) and the charge-transport layer (CTL) is crucial for improving the efficiency and stability of PVK-based solar cells (PSCs). Here, a new bathocuproine (BCP)-based nonconjugated polyelectrolyte (poly-BCP) is synthesized and this is introduced as a "dual-side passivation layer" between the tin oxide (SnO₂ ) CTL and the PVK absorber. Poly-BCP significantly suppresses both bulk and interfacial nonradiative recombination by passivating oxygen-vacancy defects from the SnO₂ side and simultaneously scavenges ionic defects from the other (PVK) side. Therefore, PSCs with poly-BCP exhibits a high power conversion efficiency (PCE) of 24.4% and a high open-circuit voltage of 1.21 V with a reduced voltage loss (PVK bandgap of 1.56 eV). The non-encapsulated PSCs also show excellent long-term stability by retaining 93% of the initial PCE after 700 h under continuous 1-sun irradiation in nitrogen atmosphere conditions.

Keywords: interface engineering; nonconjugated polymers; nonradiative recombination; organometal halide perovskites; perovskite solar cells.

Abstract

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