p‑Doping of a Hole Transport Material via a Poly(ionic liquid) for over 20% Efficiency and Hysteresis-Free Perovskite Solar Cells

An efficient metal-free formulation of a hole transport material (HTM) based on an ionic liquid polymer is developed for n–i–p perovskite solar cells (PSCs), to address reproducibility issues related to the use of complex dopant mixtures based on lithium salts and cobalt coordination complexes. The...

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Veröffentlicht in:ACS applied energy materials 2020-02, Vol.3 (2), p.1393-1401
Hauptverfasser: Geffroy, Camille, Grana, Eftychia, Bessho, Takeru, Almosni, Samy, Tang, Zeguo, Sharma, Anirudh, Kinoshita, Takumi, Awai, Fumiyasu, Cloutet, Eric, Toupance, Thierry, Segawa, Hiroshi, Hadziioannou, Georges
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container_issue 2
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container_title ACS applied energy materials
container_volume 3
creator Geffroy, Camille
Grana, Eftychia
Bessho, Takeru
Almosni, Samy
Tang, Zeguo
Sharma, Anirudh
Kinoshita, Takumi
Awai, Fumiyasu
Cloutet, Eric
Toupance, Thierry
Segawa, Hiroshi
Hadziioannou, Georges
description An efficient metal-free formulation of a hole transport material (HTM) based on an ionic liquid polymer is developed for n–i–p perovskite solar cells (PSCs), to address reproducibility issues related to the use of complex dopant mixtures based on lithium salts and cobalt coordination complexes. The conductivity of the HTM is thus significantly improved by 4 orders of magnitude, up to 1.9 × 10–3 S·cm–1, using poly­(1-butyl-3-vinylimidazolium bis­(trifluoromethylsulfonyl)­imide) (PVBI-TFSI) as dopant. Introduced in the FTO/c-TiO2/mp-TiO2/K0.05 (MA0.15FA0.85)0.95PbI2.55Br0.45/HTM/Au PSC configuration, PVBI-TFSI-HTM formulation shows power conversion efficiency as high as 20.3%, versus 18.4% for the standard lithium salt-HTM formulation, with considerably reduced hysteresis and excellent reproducibility. Mechanistic investigations suggest that PVBI-TFSI acts as a source of protons promoting the HTM oxidation.
doi_str_mv 10.1021/acsaem.9b01819
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Material chemistry
Polymers
title p‑Doping of a Hole Transport Material via a Poly(ionic liquid) for over 20% Efficiency and Hysteresis-Free Perovskite Solar Cells
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