@article{10902/32192,
year = {2023},
month = {1},
url = {https://hdl.handle.net/10902/32192},
abstract = {Bifacial Cu(In,Ga)Se2 (CIGS) solar cells are attractive for a range of applications, but their low power conversion efficiency is a limitation. To improve their efficiency, the formation of GaOx at the CIGS/transparent-conducting-oxide interface and charge recombination near this interface under rear illumination need to be suppressed. In the study reported here we prevented the formation of GaOx by silver-promoted low-temperature growth of the CIGS layer. This process also led to an improvement in the absorber quality, a steep Ga gradient near the back interface and reduced the absorption of the transparent conducting oxide. We also report here a certified bifacial solar cell on a glass substrate with efficiencies of 19.77% and 10.89% under front and rear illumination, respectively. We also fabricated bifacial solar cells directly on flexible substrates. Finally, we prepared bifacial perovskite/CIGS tandem solar cells in a four-terminal configuration, achieving a power generation density of 28.0 mW cm-2 under 1 Sun and 30% albedo illumination.},
organization = {This work has received funding from the Swiss Federal Office of Energy (SFOE) (SI/502310-01 25 “ACIGS”). This work was partially supported by Young Scholar Fellowship Einstein Program of 26 MOST, Taiwan (grant no. MOST 110-2636-E-007-015) Huagui Lai thanks the funding of China 27 Scholarship Council (CSC) from the Ministry of Education of P. R. China. This project has 28 received funding from the European Union’s Horizon 2020 research and innovation programme 29 under grant agreement N° 850937. The work also acknowledges the financial support from the 30 Strategic Focus Area Advanced Manufacturing under the project AMYS - Advancing manufac 31 turability of hybrid organic-inorganic semiconduc-tors for large area optoelectronics. 32 The authors gratefully acknowledge the use of UHRTEM (Dr. Chong-Chi Chi) and HRTEM 33 (Ms. Yi-Jen Yu) equipment belonging to the Instrumentation Center at National Tsing Hua 34 University in Taiwan and FIB (Dr. Wei-Ni Lee) at CNMM of the National Tsing Hua University 35 in Taiwan.},
publisher = {Springer Nature},
publisher = {Nature Energy, 2023, 8(1), 40-51},
title = {Efficiency boost of bifacial Cu(In,Ga)Se2 thin-film solar cells for flexible and tandem applications with silver-assisted low-temperature process},
author = {Yang, Shih-Chi and Lin, Tzu-Ying and Ochoa Gómez, Mario and Lai, Huagui and Kothandaraman, Radha and Fu, Fan and Tiwari, Ayodhya N. and Carron, Romain},
}