Carbon-Quantum-Dot-Doped Natural Dye Extracted from Celery as Sensitizer for TiO2 Solar Cells
Shaomin Liu a, Lihong Liu a, Zhangfeng Shen a
a Department of Chemical Engineering,Curtin University, Kent Street, Bentley, Perth, Western Australia, Perth, 6102, Australia
Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
Proceedings of International Conference Asia-Pacific Hybrid and Organic Photovoltaics (AP-HOPV17)
Yokohama-shi, Japan, 2017 February 2nd - 4th
Organizers: Tsutomu Miyasaka and Iván Mora-Seró
Poster, Zhangfeng Shen, 079
Publication date: 7th November 2016

Exploration and development of ‘green’ materials for photovoltaic devices have attracted intense attention since green plants exemplify solar energy conversion. Inspired by the sophisticated system of nature plants, here, we have demonstrated an eco-friendly and effective light sensitizer to be applied in solar cells, which can be prepared in one step via hydrothermal treatment of celery leaves extractive. Heat treatment will degrade the natural dyes and introduce carbon quantum dots (CQDs) into the extractive. The effects of hydrothermal temperatures on the CQD formation and the nature dye survival have been investigated. Experimental results indicate after heat-treatment at 120°C for 2.5 hours, the formed CQDs have particles size ranged from 4~6 nm together with some dyes surviving. The nanocrystalline TiO2 solar cells using this hydrothermally treated extractive as light sensitizer can achieve the best power conversion efficiency of 0.482% under AM 1.5G one full sun illumination, which is 1.7 times higher than the solar cell using the original extractive as the sensitizer and 1.5 times higher than the one based on pure CQD sensitizer. The doped CQDs can improve the energy efficiency by facilitating the electron/energy transfer in the dye-semiconductor complex and thus may provide a useful approach for the development of highly efficient photoelectric devices.

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