%0 Journal Article
%A Prasoon, Anupam
%A Dacha, Preetam
%A Zhang, Heng
%A Unsal, Elif
%A Hambsch, Mike
%A Croy, Alexander
%A Fu, Shuai
%A Ngan Nguyen, Nguyen
%A Liu, Kejun
%A Qi, Haoyuan
%A Chung, Sein
%A Jeong, Minyoung
%A Gao, Lei
%A Kaiser, Ute
%A Cho, Kilwon
%A Wang, Hai I.
%A Dong, Renhao
%A Cuniberti, Gianaurelio
%A Bonn, Mischa
%A Mannsfeld, Stefan
%A Feng, Xinliang
%T High‐Performance Phototransistor Based on a 2D Polybenzimidazole Polymer
%J Advanced materials
%V 37
%N 33
%@ 0935-9648
%C Weinheim
%I Wiley-VCH
%M PUBDB-2025-01777
%P 2505810
%D 2025
%X Photodetectors are fundamental components of modern optoelectronics, enabling the conversion of light into electrical signals. The development of high-performance phototransistors necessitates materials with both high charge carrier mobility and robust photoresponse. However, achieving both in a single material poses challenges due to inherent trade-offs. Herein, this study introduces a polybenzimidazole-(1,3-diazole)-based 2D polymer (2DPBI), synthesized as few-layer, crystalline films covering ≈28 cm2 on the water surface at room temperature, with large crystalline domain sizes ranging from 110 to 140 µm2. The 2DPBI incorporates a π-conjugated photoresponsive porphyrin motif through a 1,3-diazole linkage, exhibiting enhanced π-electron delocalization, a narrow direct band gap of ≈1.18 eV, a small reduced electron–hole effective mass (m* = 0.171 m0), and a very high resonant absorption coefficient of up to 106 cm−1. Terahertz spectroscopy reveals excellent short-range charge carrier mobility of ≈240 cm2 V−1 s−1. Temperature-dependent photoconductivity measurements and theoretical calculations confirm a band-like charge transport mechanism. Leveraging these features, 2DPBI-based phototransistors demonstrate an on/off ratio exceeding 108, photosensitivity of 1.08 × 107, response time of 1.1 ms, and detectivity of 2.0 × 1013 Jones, surpassing previously reported standalone few-layer 2D materials and are on par with silicon photodetectors. The unique characteristics of 2DPBI make it a promising foundation for future optoelectronic devices.
%F PUB:(DE-HGF)16
%9 Journal Article
%R 10.1002/adma.202505810
%U https://bib-pubdb1.desy.de/record/629249