Journal
PHYSICA STATUS SOLIDI-RAPID RESEARCH LETTERS
Volume 14, Issue 4, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/pssr.201900701
Keywords
CsF-postdeposition treatment; high efficiency; heat-light soaking; heat soaking; metastable behavior
Funding
- JSPS KAKENHI [19K15029]
- Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan [JPMXP09F19AT0147]
- Grants-in-Aid for Scientific Research [19K15029] Funding Source: KAKEN
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Metastable behavior of cesium fluoride (CsF)-treated Cu(In1-x,Ga-x)Se-2 (CIGS) solar cells is investigated under heat-light soaking (HLS) and heat-soaking (HS) treatments. HLS increases open-circuit voltage, fill factor, efficiency, and net carrier concentration and decreases short-circuit current density, whereas heat-soaking treatment acts oppositely. The performance of a CsF postdeposition treatment to CIGS thin film in selenium vapor, and closer to stoichiometry copper content, did not mitigate the open-circuit voltage improvement after HLS. These results argue the traditional concept of the V-Se-V-Cu divacancy complex for the total beneficial effect of HLS in alkali-treated CIGS solar cells. The metastable behavior observed in the CsF-treated devices due to the HLS and HS treatments is explained by the specific behavior of alkali-containing new compounds at the surface and/or the migration of alkali metals at the surface and bulk regions.
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