Copper indium selenide water splitting photoanodes with artificially designed heterophasic blended structure and their high photoelectrochemical performances
| Autor: | Seung Ki Baek, Hyung Koun Cho, Jae Hong Yoon, Yong Hun Kwon, Han-Bo-Ram Lee, Hyun Woo Do, Sang-Woo Kim, Joo Sung Kim, Young Been Kim, Young Dae Yun, Sung Woon Cho |
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| Rok vydání: | 2018 |
| Předmět: |
Photocurrent
Materials science Renewable Energy Sustainability and the Environment Nanoparticle chemistry.chemical_element 02 engineering and technology Photoelectrochemical cell 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Crystal chemistry.chemical_compound chemistry Chemical engineering Selenide Reversible hydrogen electrode Water splitting General Materials Science Electrical and Electronic Engineering 0210 nano-technology Indium |
| Zdroj: | Nano Energy. 46:1-10 |
| ISSN: | 2211-2855 |
| DOI: | 10.1016/j.nanoen.2018.01.023 |
| Popis: | Conventional p-CuInSe2 absorbers for solar cells have been homogenously synthesized using multi-step process despite a narrow crystal phase region in the phase diagram and the existence of various secondary phases. In contrast, here we propose artificially-designed heterophasic blended copper indium selenide compounds for water splitting photoanodes using a simple one-step annealing synthetic process where the electrodeposited metal precursors were directly annealed with Se vapor injection and without additional intermediate steps. The resultant product is revealed to possess a novel “phase-blended structure” comprising two phases of p-type CuInSe2 and n-type CuIn3Se5 crystals. The CuInSe2 nanoparticles with a higher Cu fraction are three-dimensionally (3D) embedded in the n-type CuIn3Se5 matrix, which has been verified by various analysis methods such as X-ray diffraction, transmission electron microscopy, and capacitance-voltage curve. The average diameter of the CuInSe2 nanoparticles is 66.8 nm and the interval between the nanoparticles in the CuIn3Se5 matrix is 67.6 nm. Consequently, the phase-blended structure photoabsorber exhibits a remarkably enhanced anodic photocurrent of 12.7 mA/cm2 at 1.23 V versus the reversible hydrogen electrode. The considerably enhanced photocurrent gain of the phase-blended structure photoanode is attributed to the excellent charge separation facilitated by the built-in potential generated from the 3D p-n junction. |
| Databáze: | OpenAIRE |
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