Korean Journal of Materials Research, Vol.12, No.12, 918-923, December, 2002
Cu 2 Te 배면 전극을 이용한 p-type CdTe 태양전지의 ohmic contact 형성 및 CdTe 태양전지의 광전압 특성
Formation of Ohmic Contact in P-Type CdTe Using Cu 2 Te Electrode and Its Effect on the Photovoltaic Properties of CdTe Solar Cells
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In this work, CdTe films were deposited on CdS/ITO/glass substrate by a close spaced sublimation (CSS) method. A Cu 2 Te layer was deposited on the CdTe film by evaporating Cu 2 Te powder. Then the samples were annealed for p+ ohmic contact. TEM and XRD analysis showed that CdTe/Cu 2 Te interface exhibited different forms with various annealing temperature. A good p+ ohmic contact was achieved when the annealing temperature was between 180 ? C to 200 ? C . Best cell efficiency of 12.34% was obtained when post annealing temperature was 200 ? C for 5 min. Thermal stress test of the CdS/CdTe cells with carbon back contact showed that the Cu 2 Te contact was stable at 50 ? C in N 2 and was slowly degraded at 100 ? C in N 2 . In comparison to the conventional carbon contact, the Cu 2 Te contact showed a better thermal stability.
- Chu TL, Chu SS, Frerkides C, Wu CQ, Britt J, Wang C, J. Appl. Phys., 70, 7608 (1991)
- Mitchell KW, Fahrenbruch AL, Bube RH, J. Appl. Phys., 48, 829 (1977)
- Romeo N, Bosio A, Tedeschi R, Romeo A, Canevari V, Sol. Energy Mater. Sol. Cells, 58(2), 209 (1999)
- Abken AE, Bartelt OJ, Thin Solid Films, 403 (2002)
- Bube RH, Photovoltaic Materials, Imperial College Press, London, 146 (1998) (1998)
- Moller HJ, Semiconductors for solar cells, Artech, Boston, 289 (1993) (1993)
- Dobson KD, Visoly-Fisher I, Hodes G, Cahen D, Sol. Energy Mater. Sol. Cells, 62(3), 295 (2000)
- Niemegeers A, Burgelman M, J. Appl. Phys., 81(6), 2881 (1997)
- Uda H, Ikegami S, Sonomura H, Sol. Energy Mater. Sol. Cells, 50(1), 141 (1998)
- Soliman M, Renew. Energy, 23(3-4), 355 (2001)