Atmospheric Modified Thiol-Based Solution Deposition for Cu 2 ZnSn(S,Se) 4 Absorber Layer
- PDF / 990,967 Bytes
- 6 Pages / 593.972 x 792 pts Page_size
- 70 Downloads / 184 Views
https://doi.org/10.1007/s11664-020-08375-5 Ó 2020 The Minerals, Metals & Materials Society
Atmospheric Modified Thiol-Based Solution Deposition for Cu2ZnSn(S,Se)4 Absorber Layer RUILAN CHEN,1 GUONAN CUI,1 YANCHUN YANG H. ALATA,1 XIAO TIAN,1 and O. TEGUS1,3
,1,2 YUEMIN LI,1
1.—Inner Mongolia Key Laboratory for Physics and Chemistry of Functional Materials, School of Physics and Electronic Information, Inner Mongolia Normal University, 81 Zhaowuda Road, Huhhot 010022, Inner Mongolia, China. 2.—e-mail: [email protected]. 3.—e-mail: [email protected]
Abandoning the traditional deposition of as-prepared Cu2ZnSnS4 (CZTS) thin films in a glove box, a modified thiol-based solution system suitable for deposition in air is described to further reduce device production costs. In this modified approach, metal salts and thiourea are used as the starting materials and are dissolved in a mixed solution of thioglycolic acid and 2-methoxyethanol, forming a homogeneous precursor solution. The as-deposited CZTS thin films are obtained by spin-coating the precursor solution in air, followed by the selenization process to form large-grained Cu2ZnSn(S,Se)4 thin films. Combining the microstructural results with compositional analyses, the optimal selenization conditions for the Cu2ZnSn(S,Se)4 absorber layer were found to be 540°C and 10 min. Key words: Kesterite, thiol-solution, Cu2ZnSn(S,Se)4 thin film, selenization condition
INTRODUCTION Due to their excellent properties, kesterite Cu2ZnSn(S,Se)4 (CZTSSe) photovoltaic materials have been applied to fabricate low-cost and environmentally friendly thin film solar cells.1–31 Record efficiency of Cu2ZnSn(S,Se)4 devices of 12.6% was obtained by a hydrazine-based solution,3 which indicates that solution-based approaches for deposition of thin films should have greater advantages than vacuum-based deposition methods. However, hydrazine is very toxic and not suitable for practical application and large-area deposition. Therefore, researchers have investigated and developed other low-cost and environmentally friendly solutionbased approaches,5–23 such as dimethylformamidebased, nanoparticle-based, and thiol–amine solution approaches. With these solution approaches, thin films are generally fabricated in a nitrogen-filled glove box. The use of a glove box tends to increase
(Received December 9, 2019; accepted July 29, 2020)
device production costs; however, the quality of the absorber layer will be adversely influenced without the glove box. Thus, the development of a suitable solution system for deposition of as-prepared thin films in air is a significant need. Recently, Tian et al. proposed the preparation of thin films by deposition in air using a thiol–amine solution approach, and fabricated devices with power conversion efficiency of 5.86%.24 However, we observe that the selenized CZTSSe thin films were not compact without the help of a bare sodalime glass (SLG) in their work. SLG is known to contribute sodium ions, improving the crystal grain size and compactness of CZTSSe thin
Data Loading...
