Different depositing amount of CuInS2 on TiO2 nanoarrays for polymer/CuInS2-TiO2 solar cells

摘要

This paper paper reports the deposition of CuInS2 on TiO2 nanoarrays, with different depositing amounts and demonstrates the application of TiO2-CuInS2 composites in polymer-based solar cells. The composites of TiO2-CIS1 and TiO2-CIS2 were prepared by the deposition of CuInS2 on TiO2 with one-step or two-step solvethermal reactions, respectively, and characterized by XRD, SEM, TEM, absorption spectrum and PL spectrum. Results showed that TiO2-CIS1 displayed the higher light-harvesting ability and PL quenching efficiency compared to TiO2-CIS2, although less CuInS2 was deposited on TiO2 surface. As a result, polymer/TiO2-CIS1 solar cells displayed much higher J(sc) correlated with the increased absorptivity and charge separation efficiency, and the higher V-oc was originated from the presence of strong interaction between TiO2 and CuInS2 in TiO2-CIS1 resulting in the effective modification of TiO2 surface by CuInS2. (C) 2015 Elsevier Ltd. All rights reserved.