Journal
NANO ENERGY
Volume 67, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.nanoen.2019.104201
Keywords
Solar cells; CIGS; Flexible; Polyimide; Atom probe tomography
Categories
Funding
- Korea Institute of Energy Research (KIER) [B9-2411]
- National Research Foundation of Korea - Ministry of Science and ICT of Republic of Korea [2016M1A2A2936753]
- National Research Foundation of Korea [2016M1A2A2936753] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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In this work, Cu(In,Ga)Se-2 (CIGS) solar cells on polyimide (PI) substrates were fabricated using a low-temperature three-stage co-evaporation process. To enhance device performance, the CIGS films were extrinsically doped with alkali (Na and K) using an in-situ post deposition treatment (PDT). To account for mechanisms of extrinsic alkali incorporation in CIGS solar cells on flexible polyimide, the alkali dopant concentrations in the film bulk (intragrain and grain boundary) and the surface chemistries/band structures were quantitatively investigated with various advanced characterization methods. In addition, the effects of the PDT sequences on the resulting device performance were studied with a particular emphasis on the characteristics of CIGS surfaces. By controlling the alkali incorporation into the CIGS absorber films, flexible lightweight CIGS thin-film solar cells with an efficiency of approximately 19% were obtained.
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