Muonium states in Cu2ZnSnS4 solar cell material

13th International Conference on Muon Spin Rotation, Relaxation and Resonance

Alberto, H.V.^1 ; Vilão, R.C.^1 ; Gil, J.M.^1 ; Duarte, J. Piroto^1 ; Vieira, R.B.L.^1 ; Weidinger, A.^1 ; Leitão, J.P.^2 ; Da Cunha, A.F.^2 ; Sousa, M.G.^2 ; Teixeira, J.P.^2 ; Fernandes, P.A.^2 ; Salomé, P.M.P.^3 ; Timmo, K.^4 ; Loorits, M.^4 ; Amato, A.^5 ; Luetkens, H.^5 ; Prokscha, T.^5 ; Suter, A.^5 ; Salman, Z.^5

CEMDRX, Department of Physics, University of Coimbra, R. Larga, Coimbra

P-3004-516, Portugal^1

I3N, Department of Physics, University of Aveiro, Aveiro, Portugal^2

International Iberian Nanotechnology Laboratory, Braga

4715-330, Portugal^3

Department of Materials Science, Tallinn University of Technology, Ehitajatetee 5, Tallinn

19086, Estonia^4

Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institut, Villigen PSI

CH-5232, Switzerland^5

关键词: Charge state;    Defect contents;    Diamagnetic state;    Low temperatures;    Muon diffusion;    Nuclear moment;    P type semiconductor;    Solar cell materials;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/551/1/012045/pdf
DOI  :  10.1088/1742-6596/551/1/012045

来源: IOP

【 摘 要 】

We investigated bulk and thin-film samples of the quaternary p-type semiconductor Cu2ZnSnS4 (CZTS) by μSR, in order to characterize the existing muonium signals. We find that the majority of the implanted muons form a diamagnetic state broadened by an interaction with the Cu nuclear moments, which we interpret as Mu+bound to sulphur. A paramagnetic fraction is also present at low temperatures and the ratio between the two muon charge states, Mu+and Mu0, varies between 20 and 40% prior to the onset of muon diffusion, which occurs at around 150 K. The fraction of Mu0is found to be sensitive to the defect content of the sample. The paramagnetic fraction has two different contributions and their origin is discussed and related with the muon role as a probe for charge carriers in the material.