PTAA‐Based Perovskite Photovoltaics Catching up: Ionic Liquid Engineering‐Assisted Crystallization Through Sequential Deposition

PTAA‐Based Perovskite Photovoltaics Catching up: Ionic Liquid Engineering‐Assisted Crystallization Through Sequential Deposition

Abstract PTAA as a widely studied polymeric hole transporting material, has garnered significant attention due to its outstanding thermal and chemical stability. However, the performance of PTAA‐based p‐i‐n devices is shown to lag behind counterpart utilizing oxides or SAMs. In this study, the ionic...

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Main Authors: Yongjun Li, Fei Wang, Qiannan Li, Baolei Tang, Yonggui Sun, Taomiao Wang, Xiao Liang, Jing Ma, Xianfang Zhou, Fan Zhang, Xing'ao Li, Yao Tong, Ruiyuan Hu, Mingjian Yuan, Tom Wu, Annie Ng, Hanlin Hu
Format: Article
Language:English
Published: Wiley 2025-04-01
Series:Advanced Science
Subjects:
crystallinity
ionic liquid
perovskite solar cells
p‐i‐n
PTAA
Online Access:https://doi.org/10.1002/advs.202414515
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Summary:Abstract PTAA as a widely studied polymeric hole transporting material, has garnered significant attention due to its outstanding thermal and chemical stability. However, the performance of PTAA‐based p‐i‐n devices is shown to lag behind counterpart utilizing oxides or SAMs. In this study, the ionic liquid, 1‐ethyl‐3‐methylimidazolium formate (EMIMCOOH), is innovatively introduced into the lead iodide (PbI2) precursor solution, resulting in a more pronounced mesoporous PbI2 film with expended pore‐size and denser pores. This enhancement is attributed to the coordination bond between the ─C═O group in EMIMCOOH and Pb2+. This intensified mesoporous morphology not only facilities the reaction between PbI2 and the organic layer, but also promotes the PbI2 conversion into perovskite material. Importantly, the incorporation of EMIMCOOH slows down the perovskite conversion process, increasing perovskite domain size and suppressed Pb0 trap density, resulting in a uniform perovskite layer with enhanced charge transport properties, as evidenced by the conducting atomic force microscope (c‐AFM) results. As a result, the incorporation of EMIMCOOH yields a power conversion efficiency (PCE) of 24.10% and a high fill factor exceeding 85%. Notably, the PCE of the EMIMCOOH‐modified device can still maintain 86% of the initial value after 1500 h at 25 °C in an N2 atmosphere.
ISSN:2198-3844

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