An inorganic p-type CuInS2 semiconductor was combined with the semiconducting polymer of PNDI3OT-Se1 and PNDI3OT-Se2 with different HOMO/LUMO levels for photoelectrochemical hydrogen production. Charge transfer behaviors at polymer/CuInS2 junctions were investigated by electrochemical impedance spectroscopy. The heterojunction of p-CuInS2 and n-type polymer (both PNDI3OT-Se1 and Se2) successfully made p-n junctions and showed improved charge transfer. However, we found that higher HOMO levels of polymer than valence band maximum (VBM) of CuInS2 spurred charge recombination at interfaces. As a result, CuInS2/PNDI3OT-Se1/TiO2/Pt, which has suitable energy levels matched between PNDI3OT-Se1 and CuInS2, shows photocurrent (−15.67 mA cm−2) improved concretely when compared to a CuInS2/TiO2/Pt photoelectrode (−7.11 mA cm−2) at 0.0 V vs. RHE applied potential. Additionally, the photoelectrochemical stability of CuInS2/PNDI3OT-Se1/TiO2/Pt photoelectrode was also investigated.
Bibliographical noteFunding Information:
This this study was supported by the program of the Korea Institute of Science and Technology. This work was also supported by the National Research Foundation of Korea (NRF‐2018R1A5A1025594) of the Ministry of Science and ICT. This work was supported by C1 Gas Refinery Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT and Future Planning (2015M3D3A1A01064899). these authors have equally contribution ≠
All Science Journal Classification (ASJC) codes
- Environmental Chemistry
- Chemical Engineering(all)
- Materials Science(all)