Low cost and stable quinoxaline-based hole-transporting materials with a D–A–D molecular configuration for efficient perovskite solar cells

Abstract

Molecular hole-transporting materials containing a weak electron acceptor core can simultaneously improve the stability and photovoltaic performance of perovskite solar cells.

Fluorine‐Substituted Benzotriazole Core Building Block‐Based Highly Efficient Hole‐Transporting Materials for Mesoporous Perovskite Solar Cells

“…Nevertheless, the HTMs with BTA as a core building block are merely reported and the performance is poor . Moreover, donor–acceptor–donor (D–A–D)‐type HTMs have attracted attention in the research of PSCs due to the easily tuned energy levels and good charge carrier transport properties . Based on this context, by deliberately selecting fluorine‐substituted BTA as the core building block, we synthesized two D–A–D‐type HTMs (2FBTA‐1 and 2FBTA‐2).…”

Core Structure Engineering in Hole‐Transport Materials to Achieve Highly Efficient Perovskite Solar Cells

“…It turnedo ut that with the electron-deficient BT unit introduced, the hole mobility of JY5 was enhanced and the device performance was improved compared with the reference molecule X51 containing the biphenyl core. [31] To gain ad eep understanding of the impact of core-structuree ngineering on the hole-transporting property of D-A-D type HTMs, [32][33][34] and also to investigate whether the strengthened electron-withdrawinga bility of the "A" moiety would further improve the performance of the corresponding HTM, in this work, an ew HTM with D-A-D structure was synthesized, namely JY8 (Scheme 1). In the structure of JY8, the [1,2,5]thiadiazolo [3,4-c]pyridine (PT) unit with stronger electron-withdrawing ability than the BT unit is applieda s the core structure, and N 3 ,N 3 ,N 6 ,N 6 -tetrakis(4-methoxyphenyl)-9phenyl-9 H-carbazole-3,6-diamine is used as the "D" moiety (Scheme1).…”

Synergistic Coassembly of Highly Wettable and Uniform Hole‐Extraction Monolayers for Scaling‐up Perovskite Solar Cells

“…To straightforwardly assess the charge extraction ability of the self‐assembly HELs from perovskite active layers, we conducted photoluminescence (PL) measurement and the results are shown in Figure e. We observed a stronger quench degree of the PL intensity in the sample deposited on ITO/c‐SA than that on bare ITO, indicating efficient hole extraction occurred at the perovskite/HEL interface . This result is further confirmed by time‐resolved photoluminescence (TRPL) decay kinetics measurement.…”