Estimation of open-circuit voltage of Cu(In,Ga)Se2 solar cells before cell fabrication

Jakapan Chantana, Daisuke Hironiwa, Taichi Watanabe, Seiki Teraji, Kazunori Kawamura and Takashi Minemoto

Renewable Energy, 2015, vol. 76, issue C, 575-581

Abstract: Cu(In,Ga)Se2 (CIGS) absorbers with several Ga/III, Ga/(In + Ga), profiles were fabricated by the so-called “multi layer precursor method” under the control of Ga flux rate during film's deposition. Open-circuit voltage (VOC) of CIGS solar cell is principally dependent on average band-gap energy (Eg) in space-change region (SCR) of below 1.3 eV. This average Eg in SCR, principally controlled by average Ga/III ratio in SCR, is estimated by the peak position of (220/204)-oriented CIGS films on soda-lime grass (SLG) substrates investigated by grazing incidence X-ray diffraction (GIXRD) with 0.1° incident angle, whereas the average Eg in SCR is predicted by Raman or photoluminescence (PL) peak positions of CIGS absorbers on both SLG and stainless steel (SUS) substrates. Ultimately, with the average Eg in SCR of below 1.3 eV, the (220/204) peak position (GIXRD) can be well used as a predictor of the VOC on rigid SLG substrates. On the other hand, Raman peak and PL peak positions can be well utilized as indicators of the VOC on not only rigid SLG but also flexible SUS substrates before solar cell fabrication. These are fast and non-destructive methods to evaluate the Ga content, Eg near CIGS surface, and corresponding VOC for high cell performance.

Keywords: Copper indium gallium selenide; Solar cell; Open-circuit voltage; Grazing incidence X-ray diffraction; Raman spectrum; Photoluminescence (search for similar items in EconPapers)
Date: 2015
References: View complete reference list from CitEc
Citations:

Downloads: (external link)
http://www.sciencedirect.com/science/article/pii/S0960148114008040
Full text for ScienceDirect subscribers only

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:76:y:2015:i:c:p:575-581

DOI: 10.1016/j.renene.2014.11.073

Access Statistics for this article

Renewable Energy is currently edited by Soteris A. Kalogirou and Paul Christodoulides

More articles in Renewable Energy from Elsevier
Bibliographic data for series maintained by Catherine Liu ().