Journal
APPLIED SURFACE SCIENCE
Volume 596, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2022.153589
Keywords
Heterojunctions; Nanoparticles; Intimate interfaces; Assembly; Photo-electricity
Categories
Funding
- Na-tional Natural Science Foundation of China [51873106, 22107064]
- Shanghai Municipal Government [18JC1410800]
- Interdisciplinary Program of Shanghai Jiao Tong University [YG2021QN62]
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This study successfully prepared nanoscale organic/inorganic heterojunctions using a coassembly strategy, including core/shell and hollow sandwich-type structures. The hollow sandwich-type structure exhibited more effective charge separation efficiency and its unique features benefited increased photon absorption efficacy.
Heterojunctions, especially for organic/inorganic heterojunctions (OIHJ) have been demonstrated as a robust tool to extend solar spectrum response and accelerate the separation of photoinduced chargers. However, efficient preparation of controllable OIHJ with fascinating interfacial properties still remain a challenging target. In this regard, we develop nanoscale OIHJ by a general coassembly strategy, including core/shell and hollow sandwich-type junction. Amphiphilic molecule with one polyethylene glycol arm (TBT600) and linear conjugated polymers (PFTBT) containing 9,9'-spiro-bifluorene and bis(3,4-dimethoxythiophen-2-yl)benzothiadiazole were designed. Diversified interactions and planarized stacking mode between PFTBT and TBT600 stabilized the hollow sandwich-type structure upon sonication cavitation and allows intimate PFTBT-TiO(2 i)nterfaces. Experimental results indicated that the sandwich-type heterojunctions exhibited more effective charges separation efficiency than core/shell heterojunctions. The enhanced photo-current activity could be ascribed to its unique features, including: (i) twofold intimate PFTBT-TiO2 interfaces and Z-scheme junction accelerate the charge separation/transfer amongst the nanoscale shells; (ii) hollow structure also benefits increasing photon absorption efficacy. This study provide a facile tool to prepare semiconductor heterojunctions by co-assembly strategy and reveals the advantages of hollow sandwich-type heterojunctions on exciton dissociation and photon absorption. We hope such a co-assembly strategy will provide an alternative toolbox to design functional nanomaterials for photo-electric and catalytic devices.
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