Damp heat and thermal cycling-induced degradation mechanism of AZO and CIGS films in Cu(In,Ga)Se2 photovoltaic modules

Autor:	Won-Ju Cho, Dong-Won Lee, Jun-Kwang Song, Chan-Ik Jang, Heesoo Lee, Kyung-Eun Park, Yong-Nam Kim, Jiseung Ryu, Chi-Hong Park
Rok vydání:	2015
Předmět:	Materials science Chemical engineering Band gap Electrical resistivity and conductivity Photovoltaic system General Physics and Astronomy Degradation (geology) General Materials Science Temperature cycling Thin film Copper indium gallium selenide solar cells Layer (electronics)
Zdroj:	Current Applied Physics. 15:285-291
ISSN:	1567-1739
DOI:	10.1016/j.cap.2014.12.023
Popis:	This paper characterizes and compares the degradation mechanisms of Cu(In,Ga)Se 2 (CIGS)-based thin film photovoltaic (PV) modules during exposure to damp heat (85 °C/85% RH) for 1000 h and thermal cycling (−40 °C/85 °C) for 1000 cycles. After damp heat (DH) exposure, the efficiency of the PV modules was reduced from the initial value of ∼12.5 ± 0.1% to 10.5 ± 0.2% due to increase of the resistivity in the AZO and CIGS layers. The optical band gap was also decreased from the initial value of 3.60 eV–3.54 eV after 1000-h DH exposure. This behavior was associated with oxygen adsorption and the generation of hydroxides in the AZO layer. The efficiency of the PV modules after subjection to thermal cycling (TC) was decreased to 11.4 ± 0.2% due to increase of the resistivity of the AZO and CIGS layers. The increase in the resistivity was interpreted as being due to oxygen adsorption, as well as the formation of micro-cracks in the AZO films.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::d2deab6c51f1481a71ee813d0b97d9cd https://doi.org/10.1016/j.cap.2014.12.023 Zobrazit plný text záznamu Full Text from ScienceDirect