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Karatum O, Eren GO, Melikov R, Onal A, Ow-Yang CW, Sahin M, Nizamoglu S. Quantum dot and electron acceptor nano-heterojunction for photo-induced capacitive charge-transfer. Sci Rep 2021; 11:2460. [PMID: 33510322 PMCID: PMC7843732 DOI: 10.1038/s41598-021-82081-y] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2020] [Accepted: 01/12/2021] [Indexed: 02/07/2023] Open
Abstract
Capacitive charge transfer at the electrode/electrolyte interface is a biocompatible mechanism for the stimulation of neurons. Although quantum dots showed their potential for photostimulation device architectures, dominant photoelectrochemical charge transfer combined with heavy-metal content in such architectures hinders their safe use. In this study, we demonstrate heavy-metal-free quantum dot-based nano-heterojunction devices that generate capacitive photoresponse. For that, we formed a novel form of nano-heterojunctions using type-II InP/ZnO/ZnS core/shell/shell quantum dot as the donor and a fullerene derivative of PCBM as the electron acceptor. The reduced electron–hole wavefunction overlap of 0.52 due to type-II band alignment of the quantum dot and the passivation of the trap states indicated by the high photoluminescence quantum yield of 70% led to the domination of photoinduced capacitive charge transfer at an optimum donor–acceptor ratio. This study paves the way toward safe and efficient nanoengineered quantum dot-based next-generation photostimulation devices.
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Affiliation(s)
- Onuralp Karatum
- Department of Electrical and Electronics Engineering, Koc University, Istanbul, Turkey
| | - Guncem Ozgun Eren
- Department of Biomedical Sciences and Engineering, Koc University, Istanbul, Turkey
| | - Rustamzhon Melikov
- Department of Electrical and Electronics Engineering, Koc University, Istanbul, Turkey
| | - Asim Onal
- Graduate School of Materials Science and Engineering, Koc University, Istanbul, Turkey
| | - Cleva W Ow-Yang
- Materials Science and Nano-Engineering Program, Sabanci University, Istanbul, Turkey.,Nanotechnology Research and Application Center, Sabanci University, Istanbul, Turkey
| | - Mehmet Sahin
- Department of Nanotechnology Engineering, Abdullah Gul University, Kayseri, Turkey
| | - Sedat Nizamoglu
- Department of Electrical and Electronics Engineering, Koc University, Istanbul, Turkey. .,Department of Biomedical Sciences and Engineering, Koc University, Istanbul, Turkey. .,Graduate School of Materials Science and Engineering, Koc University, Istanbul, Turkey.
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