| Abstract:Since 21st century, with the problems of energy and environment becoming more and more serious, the R&D and large scale manufacturing of solar cells have been on the agenda of our country and gained more investment. CdTe thin film solar cells, as a kind of thin film solar cell with high effiency, low cost and stability, have been paid wide attention.During the fabrication of CdTe solar cells, etching on CdTe polycrystalline thin films is an important step. The reported etchants inlude bromine-methanol, HNO3: H3PO4 (NP), potassium dichromate-sulfuric (KD) acids and so on. BM is commonly used in laboratories, but it volatilizes easily and therefore pollutes the atmosphere heavily, which result in its improperty in being used in large-scale manufacturing. In this article, two mathods of NP( HNO3: H3PO4: de-ionized H2O =1:70:29) and BM (Br: Methanol=0.02:100) were used to etch the CdTe films repectively for 60s and 10s. For NP etched sample, the grain boundaries can be seen become widened from its AFM image; the diffraction peak of Te was observed at about 2θ=27.6°corresponding to the hexagonal (101) planes from the X-ray diffraction (XRD) measurement.Ten serials of CdTe solar cells with five different back contacts were fabricated . Through the analyses of XRD and XPS, it has been verified that a CuxTe (1 |
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