Issue 16, 2024

Conjugated small molecules based on alkylsilyl-modified triphenylamine: promising hole transport materials in perovskite photovoltaics

Abstract

There is a renascence in the use of triphenylamine (TPA)-based donor materials in the field of perovskite photovoltaics. This work presents the synthesis of two novel conjugated small molecules (CSMs), TPA-t and TPA-t EH, which are functionalized with triisopropylsilyl groups and 2-ethylhexyl side chains. These molecules show promise as hole transport materials, which possess high hole mobilities of 1.5 × 10−4 and 2.9 × 10−3 cm2 V−1 s−1. TPA-t and TPA-t EH possess HOMO energy levels at −5.38 and −5.31 eV, which are well-aligned with the valence band of standard perovskite MAPbI3. This resulted in outstanding open-circuit voltages of 1100 and 1080 mV. TPA-based molecules were investigated as HTLs in n-i-p PSCs without additional doping and enabled high efficiency (17.3%) same as for devices with the state-of-the-art polytriarylamine (PTAA) HTL. The obtained results suggest that the developed materials could potentially compete with PTAA with further material structure modification.

Graphical abstract: Conjugated small molecules based on alkylsilyl-modified triphenylamine: promising hole transport materials in perovskite photovoltaics

Supplementary files

Article information

Article type
Paper
Submitted
19 Apr 2024
Accepted
01 Jul 2024
First published
02 Jul 2024

Sustainable Energy Fuels, 2024,8, 3704-3710

Conjugated small molecules based on alkylsilyl-modified triphenylamine: promising hole transport materials in perovskite photovoltaics

I. V. Martynov, A. N. Zhivchikova, M. D. Tereshchenko, I. E. Kuznetsov, S. Baryshev, V. S. Volkov, M. Tepliakova, A. V. Akkuratov and A. V. Arsenin, Sustainable Energy Fuels, 2024, 8, 3704 DOI: 10.1039/D4SE00521J

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