| 학회 |
한국재료학회 |
| 학술대회 |
2011년 봄 (05/26 ~ 05/27, 제주 휘닉스 아일랜드) |
| 권호 |
17권 1호 |
| 발표분야 |
C. Energy and the Environment Technology(에너지 및 환경재료) |
| 제목 |
Synthesis of Cu2ZnSnS4 Quaternary Nanocrystal Formed by Annealing Precursors Prepared by Microwave-Assisted Solution Method |
| 초록 |
Nanocrystals (NCs)-based approach for thin film solar cells (TFSCs) device have been attracted considerable interest to fabricate low cost and high power conversion efficiency (PCE) TFSCs due to its low cost solar cells fabricating process. Cu2ZnSnS4 (CZTS) is a promising candidate material, which contains abundant elementals such as Zn and Sn and it has stable band gap energy of 1.5 eV and high absorption coefficient over 104 cm-1. The solution-based CZTS NCs have been prepared using different organometallic solution-based routes and the PCE for CZTS NCs-based TFSCs have been achieved about 0.8 %. However, the previous literature survey indicates that the hazardous chemicals such as trioctylphosphine, oleylamine and trioctylphosphine oxide have been used to synthesis for well uniform and high quality CZTS NCs and it has resulted in a serious environment problem. In order to solve this problem, we introduced the microwave-assisted solution method. CZTS NCs were synthesized by novel route using two-step process. In the first step, the precursors were obtained by irradiating microwave at 700W for 10 min from aqueous solutions contacting copper, zinc, tin, and sulfur elements. In the second step, the precursors were sulfurized by annealing in the mixture of H2S (5%) + N2 (95%) atmosphere at 550 oC for 1 hour. The structural, compositional, thermal and optical characteristics of CZTS NCs were investigated. X-ray diffraction patterns, X-ray photoelectron spectroscopy and transmission electron microscopy results showed that the sulfurized NCs were a single kieserite CZTS phase without any secondary phase such as Cu2SnS3, ZnS, CuS and SnS. TGA and DTA indicated a weight loss at 840 °C and endothermic peak at same temperature from CZTS nature. Energy dispersive X-ray results showed that CZTS NCs was Cu and Zn rich and S poor. UV-VIS spectroscopy results indicated that the absorption coefficient constant was over 104 cm-1 in the visible region and direct band gap energy of CZTS NCs was estimated about1.5 eV. |
| 저자 |
Seung Wook Shina1, Jun Hee Han2, Chan Young Park1, Jong-Ha Moon2, Jeong Yong Lee3, Jin Hyeok Kim1
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| 소속 |
1Department of Materials Science and Engineering, 2KAIST, 3Photonics Technology Research Institute |
| 키워드 |
Cu2ZnSnS4 (CZTS); Nanocrystals (NCs); Thin Film Solar Cells (TFSCs) chalcoegenide semcomductor;
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| E-Mail |
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