Photovoltaic performances of Cu<inf>2-x</inf>Te sensitizer based on undoped and indium³⁺-doped TiO<inf>2</inf> photoelectrodes and assembled counter electrodes

• Main Authors: Srathongluan P., Kuhamaneechot R., Sukthao P., Vailikhit V., Choopun S., Tubtimtae A.
• Format: Journal
• Published: 2017
• Online Access: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84945587274&origin=inward; http://cmuir.cmu.ac.th/jspui/handle/6653943832/42115
• Institution: Chiang Mai University

© 2015 Elsevier Inc. Novel binary Cu 2-x Te nanoparticles based on undoped and indium-doped TiO 2 photoelectrodes were synthesized using a successive ionic layer adsorption and reaction (SILAR) technique as a sensitizer for liquid-junction solar cells. A larger diameter of TiO 2 promoted a narrower energy band gap after indium doping, attributing to yield a broader absorption range of nanoparticle sensitizer due to the increasing amount of Cu 2-x Te NPs on TiO 2 surface. The atomic percentages showed the stoichiometric formation of Cu 2 Te incorporated in a Cu 2-x Te structure. The best photovoltaic performance with the lower SILAR cycle, i.e., n=13 was performed after indium doping in both of carbon and Cu 2 S CEs and revealed that the efficiency of 0.73% under the radiant 100 mW/cm 2 (AM 1.5G). The electrochemical impedance spectroscopy (EIS) was used to investigate the electrical properties via effect of material doping and counter electrodes with a lower charge-transfer resistance (R ct ) and it was also found that the electron lifetime was improved after the sample doped with indium and assembled with carbon CE.