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Open AccessArticle

Solar Cell Applications of Solution-Processed AgInGaSe2 Thin Films and Improved Properties by Sodium Doping

1
Zhongshan Institute, University of Electronic Science and Technology of China, Zhongshan 528402, China
2
Shenzhen Polytechnic, No. 7098, Liuxian Avenue, Nanshan District, Shenzhen 518000, China
3
Guangdong Engineering-Technology Research Center of Nano-Photoelectric Functional Films and Devices, Zhongshan 528402, China
*
Authors to whom correspondence should be addressed.
Nanomaterials 2020, 10(3), 547; https://doi.org/10.3390/nano10030547
Received: 20 November 2019 / Revised: 14 January 2020 / Accepted: 14 January 2020 / Published: 18 March 2020
Binary nanoparticle inks comprising Ag2Se, In2Se3, and Ga2Se3 were fabricated via a wet ball-milling method and were further used to fabricate AgInGaSe2 (AIGS) precursors by sequentially spraying the inks onto a Mo-coated substrate. AIGS precursors were annealed under a Se atmosphere for 1 h at 570 °C. Na2Se thin layers of varying thicknesses (0, 5, 10, and 20 nm) were vacuum-evaporated onto the Mo layer prior to the AIGS precursors being fabricated to investigate the influence on AIGS solar cells. Sodium plays a critical role in improving the material properties and performance of AIGS thin-film solar cells. The grain size of the AIGS films was significantly improved by sodium doping. Secondary ion mass spectroscopy illustrated slight surficial sodium segregation and heavy sodium segregation at the AIGS/Mo interface. Double-graded band profiles were observed in the AIGS films. With the increase in Na2Se thickness, the basic photovoltaic characteristics of the AIGS solar cells were significantly improved. The highest solar cell conversion efficiency of 6.6% (open-circuit voltage: 775.6 mV, short-circuit current: 15.5 mA/cm2, fill factor: 54.9%, area: 0.2 cm2) was obtained when the Na2Se thickness was 20 nm. View Full-Text
Keywords: AgInGaSe2 solar cell; non-vacuum method; sodium doping; conversion efficiency AgInGaSe2 solar cell; non-vacuum method; sodium doping; conversion efficiency
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Zhang, X.; Sun, Q.; Zheng, M.; Duan, Z.; Wang, Y. Solar Cell Applications of Solution-Processed AgInGaSe2 Thin Films and Improved Properties by Sodium Doping. Nanomaterials 2020, 10, 547.

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