Effects of K ions doping on the structure, morphology and optical properties of Cu₂FeSnS₄ thin films prepared by blade-coating process

Abstract

Quaternary chalcogenide Cu₂FeSnS₄ (CFTS) nanoparticles, as a kind of potential absorber layer material in thin film solar cells (TFSCs), were successfully synthesized by using a convenient solvothermal method. Alkali element K is incorporated into CFTS thin films in order to further improve the surface morphology and the optical properties of related films. X-ray diffraction (XRD), Raman spectroscopy and field emission scanning electron microscopy (FESEM) were used to characterize the phase purity, morphology and composition of CFTS particles and thin films. The results show that the particle elemental ratios of Cu/(Fe+Sn) and Fe/Sn are 1.2 and 0.9, respectively, which are close to the characteristics of stoichiometric CFTS. The band gaps of CFTS films before and after doping K ions are estimated to be 1.44 eV and 1.4 eV with an error of ±0.02 eV.

References

[1] BiJ, AoJ, JengM-J, YaoL, GaoS, SunG, HeQ, ZhouZ, SunY, XiaoY-L, ChangL-B. Solar Energy Materials and Solar Cells, 2017, 159: 352

[2] LÜW-h, LUB, GONGY, HEY-f, ZHANGS. Journal of Optoelectronics·Laser, 2016, 27: 606

[3] FENGS-j, XUEY-m, LIUH, SONGD-y, XIAD, SUNH-t, LIP-y, QIAOZ-x. Journal of Optoelectronics·Laser, 2017, 28: 285

[4] DongC, MengW, QiJ, WangM. Materials Letters, 2017, 189: 104

[5] ChatterjeeS, PalA J. Solar Energy Materials and Solar Cells, 2017, 160: 233

[6] MengX, DengH, TaoJ, CaoH, LiX, SunL, YangP, ChuJ. Journal of Alloys and Compounds, 2016, 680: 446

[7] MengX, DengH, ZhangJ, ZhouW, TaoJ, SunL, YueF, YangP, ChuJ. Journal of Alloys and Compounds, 2015, 646: 68

[8] GranathK, BodegardM, StoltL. Solar Energy Materials and Solar Cells, 2000, 60: 278

[9] RudmannD, BremaudD, da CunhaAF, BilgerG, StrohmA, KaelinM, ZoggH, TiwariAN. Thin Solid Films, 2005, 480: 55

[10] TanM, HeR, YuanY, WangZ, JinX. Electrochimica Acta, 2016, 213: 148

[11] KhadkaD B, KimJ. Journal of Alloys and Compounds, 2015, 638: 103

[12] MokuralaK, MallickS. RSC Advances, 2017, 7: 15139

[13] MengX, DengH, ZhangQ, SunL, YangP, ChuJ. Materials Letters, 2017, 186: 138

[14] ZhouJ, YeZ, WangY, YiQ, WenJ. Materials Letters, 2015, 140: 119

[15] Di BenedettoF, BencistàI, D’AcapitoF, FrizzeraS, CaneschiA, InnocentiM, LavacchiA, MontegrossiG, OberhauserW, RomanelliM, DittrichH, PardiL A, TippeltG, AmthauerG. Physics and Chemistry of Minerals, 2016, 43: 535

[16] KevinP, MalikM A, McadamsS, O’BrienP. Journal of the American Chemical Society, 2015, 137: 15086