Charge extraction from TiO2 nanotubes sensitized with CdS quantum dots by SILAR method

CECILIA VAZQUEZ; ANA M BARUZZI; RODRIGO A. IGLESIAS

IEEE Journal of Photovoltaics

IEEE Explore

Lugar: Florida; Año: 2016 vol. 6 p. 1515 - 1515

2156-3381

uantum dot solar cells based on different materials have received a noticeable interest during the last ten years; however their efficiency and stability are still the main drawback of this technology that leads to a lack of perfomance of these devices. Perhaps the main issue is with the electron recombination after excitation of the surface. In this work we have studied the dependence of short circuit photocurrent of TiO2 nanotubes with varying amounts of CdS nanocrystals deposited by the SILAR method. Emphasis is given on dependences with the morphology (length, diameter, etc.) of the nanotubes and the CdS coverage. We have found there is an optimum coverage of CdS for each different nanotube length. This behavior is explained and characterized in terms of prevailing recombination processes at higher CdS coverage, where quantum confinement became less important.