{'fraction_non_alphanumeric': 0.05707196029776675, 'fraction_numerical': 0.026674937965260544, 'mean_word_length': 5.530364372469635, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
The triple π-bridge strategy for tailoring indeno[2,1-b]carbazole-based HTMs enables perovskite solar cells with efficiency exceeding 21%

Methoxy-free donors are an emerging class of alternative methoxy triphenylamine materials toward stable organic hole-transporting materials (HTMs). However, low cost, stable and efficient methoxy-free donors are scarce. Moreover, the lack of a molecular design strategy limits the further development of methoxy-free donor-based HTMs. This study reports a newly developed low cost hybrid methoxy-free donor (viz., indeno[2,1-b]carbazole) as well as a triple π-bridge strategy to enhance the performance of methoxy-free donor-based HTMs. Based on this strategy, two new indeno[2,1-b]carbazole HTMs, termed M136 and M138, were tailor-made and tested in perovskite solar cells (PSCs). Upon incorporating the triple π-bridges (i.e. thiophene-dithieno[3,2-b:2′,3′-d]pyrrole-thiophene and thiophene-3,4-ethylenedioxythiophene-thiophene), the resulting indeno[2,1-b]carbazole HTMs (M136 and M138) exhibit a significantly increased hole mobility, improved charge extraction and minimized trap-assisted recombination as compared to M135 and M137 with unitary and binary bridges, respectively. Consequently, the optimized devices based on M138 achieved an efficiency of 21.37%, which is among the top efficiencies for PSCs based on methoxy-free donor HTMs. The findings demonstrate that indeno[2,1-b]carbazole is an excellent methoxy-free donor. In addition, this work underscores the effectiveness of π-bridge engineering to improve the performance of methoxy-free donor-based HTMs.