Point defects in Cu2ZnSnSe4 (CZTSe): Resonant X‐ray diffraction study of the low‐temperature order/disorder transition

作者: L. T. Schelhas , K. H. Stone , S. P. Harvey , D. Zakhidov , A. Salleo

DOI: 10.1002/PSSB.201700156

关键词:

摘要: The interest in Cu2ZnSn(S,Se)4 (CZTS) for photovoltaic applications is motivated by similarities to Cu(In,Ga)Se2 while being comprised of non-toxic and earth abundant elements. However, CZTS suffers from a Voc deficit, where the much lower than expected based on band gap, which may be result high concentration point-defects lattice. Recently, reports have observed low-temperature order/disorder transition Raman optical spectroscopies films reported describe ordering Cu Zn atoms crystal structure. To directly determine level Cu/Zn ordering, we used resonant-XRD, site, element specific probe long range order. We CZTSe annealed just below quenched above temperature; previous work, should ordered highly disordered, respectively. Our data show that there some near low temperature but significantly less chemical order Raman. understand both our resonant-XRD results results, present structural model involves antiphase domain boundaries accommodates excess within

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