Influence of surface treatments on CdSe thin films in photoelectro-chemical solar energy conversion |
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Authors: | Shikha Mishra Sanjay Tiwari B P Chandra |
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Affiliation: | (1) Department of Post Graduate Studies and Research in Physics, R.D. University, 482 001 Jabalpur, India;(2) Department of Physics, Govt. Autonomous Science College, 482 001 Jabalpur, India |
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Abstract: | Photovoltaic performance of semiconductor-liquid junction solar cell using electro-codeposited thin filmn-CdSe is found to improve significantly by proper surface treatments. The solid state parameters of annealed films are calculated
and compared with those of unannealed film-based cells. Chemical etching is found to improve short circuit current and fill
factor whereas photoelectrochemical etching technique improves the stability of photoanode in polysulphide electrolyte. Annealing
promotes incipient fusion of small crystallites, thus reducing the grain boundaries which are known to act as recombination
centres for minority carriers and trapping centre for majority carriers. The conversion efficiency and stability are found
to improve by chemical etching of the semiconductor layer because chemical etching pins Fermi level of CdSe photoanode and
promotes exchange current density. |
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Keywords: | PEC solar cells CdSe annealing photoelectrochemical (photo) etching cell parameters |
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