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Reducing energy loss and stabilising the perovskite/poly (3-hexylthiophene) interface through a polyelectrolyte interlayer

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Abstract

Efficient hole transport materials in n–i–p structured perovskite solar cells (PSCs) have been confined to 2,2′,7,7′-tetrakis(N,N-di-p-methoxyphenylamine)-9,9′-spirobifluorene (Spiro-OMeTAD) and poly(triarylamine) (PTAA). However, the need for hygroscopic dopants has limited improvements in the stability of the devices. Here, we have successfully fabricated stable PSCs using a dopant-free poly (3-hexylthiophene) (P3HT) HTL. Through introducing a polyelectrolyte buffer layer (P3CT-BN), the P3HT film morphology, perovskite built-in electric field, surficial defects and the hole transfer speed were all optimized, along with significant suppression of interfacial recombination. Hence, the efficiency was improved from 13.13% to 19.23%, with a substantially improved VOC from 0.90 V to 1.10 V and FF from 63.1% to 74.2%. Simultaneously, the un-encapsulated devices also exhibited improved stability, retaining 80% of the peak PCE in the atmosphere (50% relative humidity) for 2300 h or heating at 85 °C in N2 for 400 h and 79% of the original PCE under simultaneous damp heat (60 °C/60–70% humidity) in air.

Graphical abstract: Reducing energy loss and stabilising the perovskite/poly (3-hexylthiophene) interface through a polyelectrolyte interlayer

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Article information


Submitted
17 Feb 2020
Accepted
05 Mar 2020
First published
06 Mar 2020

J. Mater. Chem. A, 2020, Advance Article
Article type
Paper

Reducing energy loss and stabilising the perovskite/poly (3-hexylthiophene) interface through a polyelectrolyte interlayer

W. Zhang, L. Wan, S. Fu, X. Li and J. Fang, J. Mater. Chem. A, 2020, Advance Article , DOI: 10.1039/D0TA01860K

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