Wide-gap (Ag,Cu)(In,Ga)Se2 solar cells with different buffer materials—A path to a better heterojunction

QC 20200626
This contribution concerns the effect of the Ag content in wide-gap AgwCu1-wIn1-xGaxSe2 (ACIGS) absorber films and its impact on solar cell performance. First-principles calculations are conducted, predicting trends in absorber band gap energy (Eg) and band structure across the entire compositional range (w and x). It is revealed that a detrimental negative conduction band offset (CBO) with a CdS buffer can be avoided for all possible absorber band gap values (Eg = 1.0–1.8 eV) by adjusting the Ag alloying level. This opens a new path to reduce interface recombination in wide-gap chalcopyrite solar cells. Indeed, corresponding samples show a clear increase in open-circuit voltage (VOC) if a positive CBO is created by sufficient Ag addition. A further extension of the beneficial compositional range (positive CBO at buffer/ACIGS interface) is possible when exchanging CdS with Zn1-ySnyOz, because of its lower electron affinity (χ). Nevertheless, the experimental results strongly suggest that at present, residual interface recombination still limits the performance of solar cells with optimized CBO, which show an efficiency of up to 15.1% for an absorber band gap of Eg = 1.45 eV.

Sopiha, Kostiantyn V.Uppsala universitet,Solcellsteknik(Swepub:uu)kosso407 (author)
Stolt, O.Uppsala universitet,Solcellsteknik (author)
Stolt, L.Uppsala universitet,Solcellsteknik (author)
Persson, ClasKTH,Materialvetenskap,Department of physical science and engeneering, Uni Oslo(Swepub:kth)u16hf74r (author)
Scragg, J. J. S.Uppsala universitet,Solcellsteknik (author)
Törndahl, T.Uppsala universitet,Solcellsteknik (author)
Edoff, MarikaUppsala universitet,Solcellsteknik(Swepub:uu)maribode (author)
Uppsala universitetSolcellsteknik (creator_code:org_t)

By the author/editor: Keller, Jan; Sopiha, Kostiant ...; Stolt, O.; Stolt, L.; Persson, Clas; Scragg, J. J. S.; show more...; Törndahl, T.; Edoff, Marika; show less...

About the subject

Kungliga biblioteket hanterar dina personuppgifter i enlighet med EU:s dataskyddsförordning (2018), GDPR. Läs mer om hur det funkar här.
Så här hanterar KB dina uppgifter vid användning av denna tjänst.