High-purity Sb2S3 thin film deposited by spin-coating process and its application for solar cells

Sang-Ju Lee^a, Dae-Hwan Kim^a, Dae-Kue Hwang^a, Shi-Joon Sung^a, Eun Kyung Gil^a

^aEnergy Research Division, Daegu Gyeongbuk Institute of Science and Technology, 333 Techno Jungang Daero, Hyeonpung-Myeon, Dalseong-Gun, Daegu, 711, Korea, Republic of

International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics 2015 (HOPV15)

Roma, Italy, 2015 May 11th - 13th

Organizer: Filippo De Angelis

Poster, Shi-Joon Sung, 334
Publication date: 5th February 2015

Sb₂S₃ inorganic semiconductor is a representative absorber material for inorganic-organic hybrid solar cells. To date, Sb₂S₃ is normally deposited by chemical bath deposition (CBD) method. However, the formation of antimony oxides cannot be avoided by the conventional CBD method, which makes deep traps and cause the backward recombination of generated charge carriers. In addition, thickness control of Sb₂S₃ thin film by CBD method is difficult due to exponential growth behavior of CBD method. In order to overcome these drawbacks of conventional CBD method, simple spin-coating process for depositing Sb₂S₃ thin film was proposed in our work. Thiourea, which is a versatile metal-ion complexing agent, was used for preparing precursor solutions and the precursor solutions were spin-coated on TiO₂ blocking layer. By controlling the condition of spin coating, such as chemical composition of precursor solutions, deposition temperature, it was possible to manipulate the chemical composition and morphology of Sb₂S₃ thin films, which was closely related with photovoltaic properties of Sb₂S₃-sensitized solar cells. Sb₂S₃-sensitized solar cells with spin-coated Sb₂S₃ absorbers showed better performance compared with conventional CBD Sb₂S₃ absorbers.

Choi, Y. C.; Lee, D. U.; Noh, J. H.; KIm, E. K.; Seok, S. I. Highly Improved Sb2S3 Sensitized-Inorganic Organic Heterojunction Solar Cells and Quantification of Traps by Deep-Level Transient Spectroscopy. Adv. Funct. Mater. 2014, 24, 3587-3592. KIm, D. H.; Lee, S. J.; Park, M. S.; Kang, J. K.; Heo, J. H.; Im, S. H.; Sung, S. J. Highly reproducible planar Sb2S3-sensitized solar cells based on atomic layer deposition. Nanoscale 2014, 6, 14549-14554.

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