Abstract

Two monomers, M:OO and M:ON, and their corresponding polymers, P:OO and P:ON, were prepared from styrene derivatives N,N-diphenyl-4-vinyl-aniline with different substituents (-OCH3 and -N(CH3)2) in the N-phenyl para positions. The polymers were synthesised and fully characterised to study their function as hole transport materials (HTMs) in perovskite solar cells (PSCs). The thermal, optical and electrochemical properties and performance of these monomers and polymers as HTMs in PSCs were compared in terms of their structure. The polymers form more stable amorphous glassy states and showed higher thermal stability than the monomers. The different substituent in the para position influenced the highest occupied molecular orbital (HOMO) level, altering the oxidation potential. Both monomers and polymers were employed as HTMs in perovskite solar cells with a device configuration FTO/bl-TiO2/mp-TiO2/CH3NH3PbI3/HTM/Au resulting in power conversion efficiencies of 7.48% for M:OO, 5.14% for P:OO, 5.28% for P:ON and 3.52% for M:ON. Although showing comparatively low efficiencies, the polymers showed much superior reproducibility in comparison with Spiro-OMeTAD or the monomers, suggesting further optimisation of polymeric HTMs with redox side groups is warranted.

Highlights

  • Two monomers, M:OO and M:ON, and their corresponding polymers, P:OO and P:ON, were prepared from styrene derivatives N,N-diphenyl-4-vinyl-aniline with different substituents (–OCH3 and –N(CH3)2) in the N-phenyl para positions

  • Two different substituted styrenic triarylamines were prepared followed by inexpensive free radical polymerization using AIBN to study and compare their properties and function as hole transport materials (HTMs) in perovskite solar cells

  • Free radical polymerization was chosen to provide a costeffective route to the polymeric HTMs, avoiding complications from controlled radical polymerization methods to directly compare monomers and polymers

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Summary

Introduction

N-( p-(dimethylamino)phenyl-N-(p-methoxyphenyl)-4-vinyl-aniline) (M:ON), and their corresponding side-chain polymers (P:OO and P:ON, Fig. 1). Two different substituted styrenic triarylamines were prepared followed by inexpensive free radical polymerization using AIBN to study and compare their properties and function as HTMs in perovskite solar cells

Results and discussion
Conclusions
Materials and synthesis
Synthesis and characterisation
Optical characterization
Electrochemical characterization
Computational details
Perovskite solar cells and characterisation
Findings
Time resolved photoluminescence
Full Text
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