Two-Dimensional Polycyclic Photovoltaic Molecule with Low Trap Density for High-Performance Photocatalytic Hydrogen Evolution

Zhang, Zhenzhen; Si, Wenqin; Wu, Baohua; Wang, Wei; Li, Yawen; Ma, Wei; Lin, Yuze

doi:10.1002/anie.202114234

Title: Two-Dimensional Polycyclic Photovoltaic Molecule with Low Trap Density for High-Performance Photocatalytic Hydrogen Evolution

Journal Article · 29 December 2021 · Angewandte Chemie (International Edition)

DOI: https://doi.org/10.1002/anie.202114234 · OSTI ID:1981386

Zhang, Zhenzhen ^[1]; Si, Wenqin ^[1]; Wu, Baohua ^[2]; Wang, Wei ^[3]; Li, Yawen ^[1]; Ma, Wei ^[2];

^[1]

Chinese Academy of Sciences (CAS), Beijing (China); University of Chinese Academy of Sciences, Beijing (China)
Xi'an Jiaotong University, Shaanxi (China)
Chinese Academy of Sciences (CAS), Beijing (China)

Typical organic semiconductors show a high trap density of states (10¹⁶–10¹⁸cm^-3), providing a large number of centers for charge-carrier recombination, thus hindering the development of photocatalytic hydrogen evolution. In this report we design and synthesize a two-dimensional polycyclic photovoltaic material, named as TPP, to reduce the trap density to as low as 2.3×10¹⁵ cm^-3, which is 1–3 orders of magnitude lower than those of typical organic semiconductors. Moreover, TPP exhibits a broad and strong absorption, ordered molecular packing with a large crystalline coherence length and enhanced electron mobility. Then, the bulk heterojunction nanoparticles (BHJ-NPs) based on a blend of polymer donor (PM6) and TPP exhibit an average hydrogen evolution rate (HER) of 64.31 mmol h^-1 g^-1 under AM1.5G sunlight (100,mW cm^-2), and 72.75 mmol h^-1 g^-1 under 330–1100 nm illumination (198 mW cm^-2) higher than that of the control NPs based on typical PM6 : Y6 (62.67 mmol h^-1 g^-1).

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS); University of Chinese Academy of Sciences, Beijing (China)

Sponsoring Organization:: China Postdoctoral Science Foundation; Key Scientific and Technological Innovation Team Project of Shaanxi Province; National Natural Science Foundation of China; USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1981386

Journal Information:: Angewandte Chemie (International Edition), Journal Name: Angewandte Chemie (International Edition) Journal Issue: 10 Vol. 61; ISSN 1433-7851

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
bulk heterojunction nanoparticle
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Title: Two-Dimensional Polycyclic Photovoltaic Molecule with Low Trap Density for High-Performance Photocatalytic Hydrogen Evolution

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