TY - JOUR
T1 - Wet-etch texturing of ZnO:Ga back layer on superstrate-type microcrystalline silicon solar cells
AU - Lai, Kuang Chieh
AU - Tsai, Fu Ji
AU - Wang, Jen Hung
AU - Yeh, Chih Hung
AU - Houng, Mau Phon
N1 - Funding Information:
This work was supported by the National Science Council of Taiwan under Contract number NSC-99-2221-E-006-212 .
PY - 2011/7
Y1 - 2011/7
N2 - Surface wet etching is applied to the ZnO:Ga (GZO) back contact in μc-Si thin film solar cells. GZO transparency increases with increasing deposition substrate temperature. Texturing enhances reflective scattering, with etching around 56 s producing the best scattering, whereas etching around 5 s produces the best fabricated solar cells. Etching beyond these times produces suboptimal performance related to excessive erosion of the GZO. The best μc-Si solar cell achieves FF=68%, VOC=471 mV and JSC=21.48 mA/cm 2 (η=6.88%). Improvement is attributed to enhanced texture-induced scattering of light reflected back into the solar cell, increasing the efficiency of our lab-made single μc-Si solar cells from 6.54% to 6.88%. Improved external quantum efficiency is seen primarily in the longer wavelengths, i.e. 6001100 nm. However, variation of the fabrication conditions offers opportunity for significant tuning of the optical absorption spectrum.
AB - Surface wet etching is applied to the ZnO:Ga (GZO) back contact in μc-Si thin film solar cells. GZO transparency increases with increasing deposition substrate temperature. Texturing enhances reflective scattering, with etching around 56 s producing the best scattering, whereas etching around 5 s produces the best fabricated solar cells. Etching beyond these times produces suboptimal performance related to excessive erosion of the GZO. The best μc-Si solar cell achieves FF=68%, VOC=471 mV and JSC=21.48 mA/cm 2 (η=6.88%). Improvement is attributed to enhanced texture-induced scattering of light reflected back into the solar cell, increasing the efficiency of our lab-made single μc-Si solar cells from 6.54% to 6.88%. Improved external quantum efficiency is seen primarily in the longer wavelengths, i.e. 6001100 nm. However, variation of the fabrication conditions offers opportunity for significant tuning of the optical absorption spectrum.
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U2 - 10.1016/j.solmat.2011.02.011
DO - 10.1016/j.solmat.2011.02.011
M3 - Review article
AN - SCOPUS:79955462902
SN - 0927-0248
VL - 95
SP - 1583
EP - 1586
JO - Solar Energy Materials and Solar Cells
JF - Solar Energy Materials and Solar Cells
IS - 7
ER -