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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 Kim, Juae Kim, Chang‐Mok Oh, In‐Wook Hwang, Jehan Kim, Stefan Zeiske, Taeyoon Ki, Sooncheol Kwon, Heejoo Kim, Ardalan Armin Orcid Logo, Hongsuk Suh, Kwanghee Lee Orcid Logo

Advanced Materials, Volume: 34, Issue: 41, Start page: 2205268

Swansea University Authors: Yong Kim, Stefan Zeiske, Ardalan Armin Orcid Logo

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DOI (Published version): 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 (pol...

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Published in: Advanced Materials
ISSN: 0935-9648 1521-4095
Published: Wiley 2022
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URI: https://cronfa.swan.ac.uk/Record/cronfa62576
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
College: Faculty of Science and Engineering
Funders: EPSRC. Grant Number: EP/T028511/1
Issue: 41
Start Page: 2205268

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