Antimony-Doped Tin Oxide as Transparent Back Contact in Cu2ZnSnS4 Thin-Film Solar Cells

Antimony-doped tin oxide (Sn2O3:Sb, ATO) is investigated as a transparent back contact for Cu2ZnSnS4 (CZTS) thin-film solar cells. The stability of the ATO under different anneal conditions and the effect from ATO on CZTS absorber growth are studied. It is found that ATO directly exposed to sulfurizing anneal atmosphere reacts with S, but when covered by CZTS, it does not deteriorate when annealed at T < 550 degrees C. The electrical properties of ATO are even found to improve when CZTS is annealed at T = 534 degrees C. At T = 580 degrees C, it is found that ATO reacts with S and degrades. Analysis shows repeatedly that ATO affects the absorber growth as large amounts of Sn-S secondary compounds are found on the absorber surfaces. Time-resolved anneal series show that these compounds form early during anneal and evaporate with time to leave pinholes behind. Device performance can be improved by addition of Na prior to annealing. The best CZTS device on ATO back contact herein has an efficiency of 2.6%. As compared with a reference on a Mo back contact, a similar open-circuit voltage and short-circuit current density are achieved, but a lower fill factor is measured.

Kubart, Tomas,1977-Uppsala universitet,Fasta tillståndets elektronik(Swepub:uu)tomku340 (author)
Keller, JanUppsala universitet,Solcellsteknik(Swepub:uu)janke498 (author)
Moro, Marcos V.Uppsala universitet,Tillämpad kärnfysik(Swepub:uu)marmo488 (author)
Primetzhofer, DanielUppsala universitet,Tillämpad kärnfysik(Swepub:uu)danpr521 (author)
Suvanam, Sethu SavedaUppsala universitet,Fasta tillståndets elektronik(Swepub:uu)setsa483 (author)
Scragg, Jonathan J.,1983-Uppsala universitet,Fasta tillståndets elektronik(Swepub:uu)jonsc690 (author)
Platzer Björkman, Charlotte,1976-Uppsala universitet,Solcellsteknik(Swepub:uu)chpla516 (author)
Uppsala universitetSolcellsteknik (creator_code:org_t)

In:Physica Status Solidi (a) applications and materials science: Wiley216:221862-63001862-6319

By the author/editor: Englund, Sven; Kubart, Tomas, 1 ...; Keller, Jan; Moro, Marcos V.; Primetzhofer, Da ...; Suvanam, Sethu S ...; show more...; Scragg, Jonathan ...; Platzer Björkman ...; show less...

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ENGINEERING AND TECHNOLOGY: ENGINEERING AND ...; and Electrical Engin ...; and Other Electrical ...

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