Dynamic Impurity Redistributions in Kesterite Absorbers

Grini, S.Universitetet i Oslo,University of Oslo,Univ Oslo, Dept Phys, Ctr Mat Sci & Nanotechnol, POB 1048, N-0316 Oslo, Norway. (författare)

QC 20200629
Cu2ZnSn(S,Se)4 is a promising nontoxic earth-abundant solar cell absorber. To optimize the thin films for solar cell device performance, postdeposition treatments at temperatures below the crystallization temperature are normally performed, which alter the surface and bulk properties. The polycrystalline thin films contain relatively high concentrations of impurities, such as sodium, oxygen and hydrogen. During the treatments, these impurities migrate and likely agglomerate at lattice defects or interfaces. Herein, impurity redistribution after air annealing for temperatures up to 200 °C and short heavy water treatments are studied. In addition, nonuniformities of the sodium distribution on a nanometer and micrometer scale are characterized by atom probe tomography and secondary ion mass spectrometry, respectively. Sodium and oxygen correlate to a greater extent after heat treatments, supporting strong binding between the two impurities. Redistributions of these impurities occur even at room temperature over longer time periods. Heavy water treatments confirm out-diffusion of sodium with more incorporation of oxygen and hydrogen. It is observed that the increased hydrogen content does not originate from the heavy water. The existence of an “ice-like” layer on top of the Cu2ZnSnS4 layer is proposed.

TEKNIK OCH TEKNOLOGIER Materialteknik Annan materialteknik hsv//swe
ENGINEERING AND TECHNOLOGY Materials Engineering Other Materials Engineering hsv//eng
NATURVETENSKAP Kemi Materialkemi hsv//swe
NATURAL SCIENCES Chemical Sciences Materials Chemistry hsv//eng
NATURVETENSKAP Kemi Annan kemi hsv//swe
NATURAL SCIENCES Chemical Sciences Other Chemistry Topics hsv//eng
NATURVETENSKAP Fysik Den kondenserade materiens fysik hsv//swe
NATURAL SCIENCES Physical Sciences Condensed Matter Physics hsv//eng
air annealing
CZTS
impurities
kesterite
oxygen
sodium
solar cell absorber
After-heat treatment
Copper compounds
Heavy water
Hydrogen
Secondary ion mass spectrometry
Solar absorbers
Thin film solar cells
Thin films
Tin compounds
Zinc compounds
Air-annealing
Atom probe tomography
Crystallization temperature
Kesterites
Polycrystalline thin film
Post deposition treatment
Solar cell absorbers
Sulfur compounds

Aboulfadl, Hisham,1986Chalmers tekniska högskola,Chalmers University of Technology,Chalmers Univ Technol, Dept Phys, S-41296 Gothenburg, Sweden.(Swepub:cth)ahisham (författare)
Ross, NilsUppsala universitet,Solcellsteknik,Univ Oslo, Dept Phys, Ctr Mat Sci & Nanotechnol, POB 1048, N-0316 Oslo, Norway.(Swepub:uu)nilro891 (författare)
Persson, ClasKTH,Tillämpad materialfysik,Universitetet i Oslo,University of Oslo,Kungliga Tekniska Högskolan (KTH),Royal Institute of Technology (KTH),Univ Oslo, Dept Phys, Ctr Mat Sci & Nanotechnol, POB 1048, N-0316 Oslo, Norway.;KTH Royal Inst Technol, Dept Mat Sci & Engn, S-10044 Stockholm, Sweden.(Swepub:kth)u16hf74r (författare)
Platzer Björkman, Charlotte,1976-Uppsala universitet,Solcellsteknik(Swepub:uu)chpla516 (författare)
Thuvander, Mattias,1968Chalmers tekniska högskola,Chalmers University of Technology,Chalmers Univ Technol, Dept Phys, S-41296 Gothenburg, Sweden.(Swepub:cth)matthu (författare)
Vines, L.Universitetet i Oslo,University of Oslo,Univ Oslo, Dept Phys, Ctr Mat Sci & Nanotechnol, POB 1048, N-0316 Oslo, Norway. (författare)
Universitetet i OsloUniv Oslo, Dept Phys, Ctr Mat Sci & Nanotechnol, POB 1048, N-0316 Oslo, Norway. (creator_code:org_t)

Av författaren/redakt...: Grini, S.; Aboulfadl, Hisha ...; Ross, Nils; Persson, Clas; Platzer Björkman ...; Thuvander, Matti ...; visa fler...; Vines, L.; visa färre...

Om ämnet

TEKNIK OCH TEKNOLOGIER: TEKNIK OCH TEKNO ...; och Materialteknik; och Annan materialte ...

Av lärosätet: Kungliga Tekniska Högskolan; Chalmers tekniska högskola; Uppsala universitet

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