Carbon-free Cu2ZnSnS4 (CZTS) thin films were prepared via a simple spin-coating process based on a sol-gel precursor of methoxyethanol solution with metal salts and thiourea, followed by post-sulfurization. The sol-gel precursor solution was deposited onto molybdenum-coated glass substrates. The sulfurization process was carried out using a conventional furnace at 525°C for 60min in a nitrogen atmosphere with sulfur powder. The structural, morphological and compositional properties of as-sulfurized thin films were characterized using X-ray diffraction, Raman spectroscopy, scanning electron microscopy and Auger electron spectroscopy. Only a single coating of the precursor solution was applied to obtain uniform Zn-rich and Cu-poor CZTS films thicker than 1μm after post-annealing. The best solar cell fabricated with the as-prepared CZTS films of band gap energy ~1.37eV showed a short-circuit current density of 10.15mA/cm2, an open circuit voltage of 0.509V, a fill factor of 33.72% and a conversion efficiency of 1.74%.
Bibliographical noteFunding Information:
This work was conducted under the framework of the Research and Development Program of the Korea Institute of Energy Research (KIER) (B5-2419), and by the International Collaborative Energy Technology R and D Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP), granted financial resource from the Ministry of Trade, Industry and Energy, Republic of Korea (No. 20138520011120). This work was also partly supported by the Center for Advanced Meta-Materials (CAMM) funded by the Ministry of Science, ICT and Future Planning as Global Frontier Project (CAMM-No. 2014M3A6B3063703).
© 2016 John Wiley & Sons, Ltd.
- Sol-gel process
- Thin film solar cell
ASJC Scopus subject areas
- Renewable Energy, Sustainability and the Environment
- Nuclear Energy and Engineering
- Fuel Technology
- Energy Engineering and Power Technology