The silicon-based tandem solar cell is thought to be probably the most promising technique to interrupt the theoretical effectivity restrict of single-junction Si solar cells. With Si-based tandem solar cells as the underside cells, the optimum bandgap of prime cells is 1.7 eV, which allows excessive effectivity of ~45% for two-junction tandem solar cells. III-V semiconductors/Si and perovskites/Si tandem solar cells have achieved excessive effectivity ranges of ~30%, proving their feasibility. However, the soundness challenges of perovskite and the high-cost drawback of III-V semiconductors largely restrict their broad functions. Exploring new steady, low-cost, and bandgap 1.7 eV photovoltaic supplies is of nice significance in science and broad prospects in know-how.
Cadmium selenide (CdSe), a binary II-VI semiconductor, enjoys nice potential within the software of Si-based tandem solar cells as a result of of the appropriate bandgap of ~1.7 eV, wonderful optoelectronic properties, excessive stability, and low manufacturing price. Nevertheless, the progress of CdSe thin-film solar cells stays because it was 30 years in the past, and there are few systematic research on CdSe thin-film solar cells lately.
Professor Tang Jiang and his workforce have proposed a way of speedy thermal evaporation (RTE) to acquire high-quality CdSe skinny movies and have designed CdSe thin-film solar cells. This examine, entitled Rapid thermal evaporation for cadmium selenide thin-film solar cells, was revealed in Frontiers of Optoelectronics on Dec. 6, 2021.
In this examine, the RTE was employed to deposit CdSe skinny movies, which reveal excessive crystal high quality with giant grain measurement and most popular crystal orientation. Meanwhile, the sharp absorption edge at 720 nm signifies CdSe skinny movies with a direct bandgap of 1.72 eV. The sturdy photoluminescence with full width at half most of 23 nm reveals the CdSe skinny movies with comparatively few defects. Based on the high-quality CdSe skinny movies, an appropriate electron transport layer (ETL) and gap transport layer (HTL) had been launched to assemble CdSe solar cells. Finally, an effectivity of 1.88% was achieved by designing an optimum configuration of FTO/ZnO/CdS/CdSe/PEDOT/CuI.
This examine developed, for the primary time, a RTE technique to deposit CdSe skinny movies and offered a systematical characterization of the optoelectric properties. Also, it demonstrated basic guidelines for machine design and optimization for CdSe solar cells. It additionally identified the benefits of CdSe skinny movie and its solar cells. In the longer term, CdSe solar cells are of excessive potential in Si-based tandem functions, and that is worthy of additional examine.
Kanghua Li et al, Rapid thermal evaporation for cadmium selenide thin-film solar cells, Frontiers of Optoelectronics (2021). DOI: 10.1007/s12200-021-1217-1
Higher Education Press
Rapid preparation of CdSe thin-film solar cells (2022, January 10)
retrieved 10 January 2022
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