| 학회 |
한국공업화학회 |
| 학술대회 |
2014년 가을 (11/12 ~ 11/14, 엑스코(대구)) |
| 권호 |
18권 2호 |
| 발표분야 |
에너지저장변환-포스터 |
| 제목 |
Effects of Na on Cu2ZnSnS4 Thin Film Solar Cell |
| 초록 |
We verified that the solar cell characteristics improve in direct proportion to the Na concentration in a Mo layer before CZTS deposition. The grain boundaries (GBs) in an absorber layer with a higher Na concentration are passivated more efficiently. A decrease in recombination-induced losses is observed in the samples that exhibit a more efficient passivation of GBs that act as a current flow channel. Such a correlation indicates that a CZTS absorber formed on a Mo layer with a high initial Na concentration contains fewer bulk defects, which correspond to a decrease in VOC losses and improvement of solar cell characteristics. When a buffer layer was deposited on the absorber layer, Na near the absorber layer surface is diffused into a buffer layer. Na in a buffer layer acts as an ionized impurity and scatters the minority carrier; thus, the minority carrier path is deflected and the minority carrier mobility decreases. As the minority carrier mobility decreases, device series resistance (Rs) increases. |
| 저자 |
심준형1, 양기정2, 손대호1, 김대환2, 강진규2
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| 소속 |
1대구경북과학기술원 차세대융복합연구센터, 2대구경북과학기술원 에너지연구부 / 대구경북과학기술원 차세대융복합연구센터 |
| 키워드 |
Thin Film Solar Cell; CZTS; Sodium; Defect
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| E-Mail |
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