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Issue 14, 2020
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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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Supplementary files

Article information


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

J. Mater. Chem. A, 2020,8, 6546-6554
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, 8, 6546
DOI: 10.1039/D0TA01860K

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