Description:
Heterojunctions, especially for organic/inorganic heterojunctions (OIHJ) have been demonstrated as a robust tool to extend the solar spectrum response and accelerate the separation of photoinduced chargers. However, the 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 diversified interactions and planarized stacking mode with organic semiconductor stabilized the hollow sandwich-type structure and allows the intimate PFTBT-TiO 2 interfaces. Experimental results indicated that the sandwich-type heterojunctions exhibited the highest photocurrent intensity, 1.9 and 7.6 times higher than core/shell heterojunctions and the bulk mixture, respectively. The enhanced photo-current activity could be ascribed to its unique features, including: (i) the twofold intimate PFTBT-TiO 2 interfaces and Z‑scheme junction accelerate the charge separation/transfer amongst the nanoscale shells; (ii) hollow structure 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