Effect of pulse bias voltages on performance of CdTe thin film solar cells prepared by pulsed laser deposition.

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Date: Jan. 1, 2021
From: Solar Energy(Vol. 213)
Publisher: Elsevier Science Publishers
Document Type: Report; Brief article
Length: 332 words

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Keywords Pulsed laser deposition; CdS/CdTe; Pulse bias voltage Highlights * Window layer CdS was prepared by pulsed laser deposition. * As the pulse bias voltage increases from 0 V to 1000 V, the band gap of CdTe film decreases from 1.516 eV to 1.485 eV. * Pulse bias effectively improves the roll-over phenomenon of CdTe solar cells. * The efficiencies of CdTe solar cells prepared with or without pulse bias are 6.07% and 2.29%, respectively. Abstract A new method of efficiency of CdTe thin film solar cells has been proposed. In view of the characteristics of pulsed laser deposition (PLD) and combined with high power pulse bias power supply, CdTe thin films under 0, 500, 750, and 1000 V pulse bias were prepared on FTO substrates, and solar cells with FTO/CdS/CdTe/Au structure were formed. The crystal structure, vibration mode, morphology, and optical properties of the CdTe thin films deposited at different pulse bias were studied by XRD, Raman, SEM, UV--Vis spectrophotometer measurement. X-ray diffraction analysis indicated the prepared CdTe thin films had a strong (1 1 1) preferentially oriented cubic sphalerite structure. The transmission spectrum showed that with the increase of pulse bias, the absorption of CdTe films gradually moved towards the long-wave direction, and the optical bandgap decreased from 1.516 to 1.485 eV. We further fabricated FTO/CdS /CdTe/Au solar cells, with improved efficiency from 2.29% to 6.07% and excellent response performance over a long-wavelength range of over 900 nm, and the pulse bias voltage effect was significant. Author Affiliation: (a) College of Materials Science and Engineering, Sichuan University, Chengdu 610064, China (b) Institute of Basic and Applied Sciences, Egypt-Japan University of Science and Technology, Alexandria, Egypt * Corresponding author at: Sichuan University, No.24 South Section 1, Yihuan Road, Chengdu 610064, China. Article History: Received 15 August 2020; Revised 9 November 2020; Accepted 16 November 2020 Byline: Dan Wang (a), Yajun Yang (a), Tianzhen Guo (a), Xiaoyong Xiong (a), Yue Xie (a), Kelin Li (a), Bing Li [libing70@126.com] (a,*), Mohsen Ghali (b)

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Gale Document Number: GALE|A648932529