Effect of alkyl chain length on the properties of triphenylamine-based hole transport materials and their performance in perovskite solar cells

Rosinda Fuentes Pineda, Joel Troughton, Miquel Planells, Irene Sanchez Molina, Farmin Muhith, Gary Stephen Nichol, Saif Ahmed Haque, Trystan M. Watson, Neil Robertson

Research output: Contribution to journalArticlepeer-review

Abstract

A new series of diacetylide-triphenylamine (DATPA) derivatives with five different alkyl chains in the para position, MeO, EtO, nPrO, iPrO and BuO, was synthesised, fully characterised and their function as hole-transport materials in perovskite solar cells (PSC) studied. Their thermal, optical and electrochemical properties were investigated along with their molecular packing and charge transport properties to analyse the influence of different alkyl chains in the solar cells parameters. The shorter alkyl chain facilitates more compact packing structures which enhanced the hole mobilities and reduced recombination. This work suggests that the molecule with the methoxy substituent (MeO) exhibits the best semiconductive properties with a power conversion efficiency of up to 5.63%, an open circuit voltage (Voc) of 0.83 V, a photocurrent density (Jsc) of 10.84 mA cm-2 and a fill factor of 62.3% in perovskite solar cells. Upon replacing the methoxy group by longer alkyl chain substituents without changing the energy levels, there is a decrease in the charge mobility as well as PCE (e.g. 3.29% for BuO-DATPA). The alkyl chain length of semiconductive molcules plays an important role for achieving high performance perovskite solar cells.
Original languageEnglish
JournalPhysical Chemistry Chemical Physics
Early online date12 Dec 2017
DOIs
Publication statusPublished - 14 Jan 2018

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