Triphenylamine-Based Conjugated Polyelectrolyte as a Hole Transport Layer for Efficient and Scalable Perovskite Solar Cells

Amit Kumar Harit, Eui Dae Jung, Jung Min Ha, Jong Hyun Park, Ayushi Tripathi, Young Wook Noh, Myoung Hoon Song, Han Young Woo

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6 Citations (Scopus)

Abstract

π-Conjugated polyelectrolytes (CPEs) have been studied as interlayers on top of a separate hole transport layer (HTL) to improve the wetting, interfacial defect passivation, and crystal growth of perovskites. However, very few CPE-based HTLs have been reported without rational molecular design as ideal HTLs for perovskite solar cells (PeSCs). In this study, the authors synthesize a triphenylamine-based anionic CPE (TPAFS-TMA) as an HTL for p-i-n-type PeSCs. TPAFS-TMA has appropriate frontier molecular orbital (FMO) levels similar to those of the commonly used poly(bis(4-phenyl)-2,4,6-trimethylphenylamine) (PTAA) HTL. The ionic and semiconducting TPAFS-TMA shows high compatibility, high transmittance, appropriate FMO energy levels for hole extraction and electron blocking, as well as defect passivating properties, which are confirmed using various optical and electrical analyses. Thus, the PeSC with the TPAFS-TMA HTL exhibits the best power conversion efficiency (PCE) of 20.86%, which is better than that of the PTAA-based device (PCE of 19.97%). In addition, it exhibits negligible device-to-device variations in its photovoltaic performance, contrary to the device with PTAA. Finally, a large-area PeSC (1 cm2) and mini-module (3 cm2), showing PCEs of 19.46% and 18.41%, respectively, are successfully fabricated. The newly synthesized TPAFS-TMA may suggest its great potential as an HTL for large-area PeSCs.

Original languageEnglish
Article number2104933
JournalSmall
Volume18
Issue number5
DOIs
Publication statusPublished - 2022 Feb 3

Bibliographical note

Funding Information:
A.K.H. and E.D.J. contributed equally to this work. This work was supported by the National Research Foundation (NRF) of Korea (Grants NRF-2019R1A2C2085290, 2019R1A6A1A11044070) and the KU-KIST School Program. The authors thank the institute for Basic Science (IBS) Center for Molecular Spectroscopy and Dynamics (IBS-R023-D1) for providing (NMR Spectrometry) and professional technical support. This work was also supported by the Technology Development Program to Solve Climate Changes through the NRF funded by the Ministry of Science and ICT (2019M1A2A2072416), Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korea government (MOTIE) (20193091010460), Development of Super Solar cells for overcoming the theoretical limit of silicon solar cell efficiency (>30%)), a brand project (1.210043.01) of the Ulsan National Institute of Science and Technology, and the 2020 Research Fund of KOREA East-West Power Co., LTD. (EWP) (2.190433.01).

Funding Information:
A.K.H. and E.D.J. contributed equally to this work. This work was supported by the National Research Foundation (NRF) of Korea (Grants NRF‐2019R1A2C2085290, 2019R1A6A1A11044070) and the KU‐KIST School Program. The authors thank the institute for Basic Science (IBS) Center for Molecular Spectroscopy and Dynamics (IBS‐R023‐D1) for providing (NMR Spectrometry) and professional technical support. This work was also supported by the Technology Development Program to Solve Climate Changes through the NRF funded by the Ministry of Science and ICT (2019M1A2A2072416), Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korea government (MOTIE) (20193091010460), Development of Super Solar cells for overcoming the theoretical limit of silicon solar cell efficiency (>30%)), a brand project (1.210043.01) of the Ulsan National Institute of Science and Technology, and the 2020 Research Fund of KOREA East‐West Power Co., LTD. (EWP) (2.190433.01).

Publisher Copyright:
© 2021 Wiley-VCH GmbH

ASJC Scopus subject areas

  • Engineering (miscellaneous)
  • General Chemistry
  • General Materials Science
  • Biotechnology
  • Biomaterials

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