Direct Correlation of Excitonics with Efficiency in a Core-Shell Quantum Dot Solar Cell.

Autor: Dana J; Radiation and Photochemistry Division, Bhabha Atomic Research Centre, Mumbai, 400085, India.; Homi Bhabha National Institute, Anushakti Nagar, Mumbai, 400094, India., Maiti S; Radiation and Photochemistry Division, Bhabha Atomic Research Centre, Mumbai, 400085, India.; Department of Chemistry, Savitribai Phule Pune University, Ganeshkhind, Pune, 411007, India., Tripathi VS; Radiation and Photochemistry Division, Bhabha Atomic Research Centre, Mumbai, 400085, India., Ghosh HN; Radiation and Photochemistry Division, Bhabha Atomic Research Centre, Mumbai, 400085, India.; Homi Bhabha National Institute, Anushakti Nagar, Mumbai, 400094, India.; Institute of Nano Science and Technology, Mohali, Punjab, 160062, India.
Jazyk: angličtina
Zdroj: Chemistry (Weinheim an der Bergstrasse, Germany) [Chemistry] 2018 Feb 16; Vol. 24 (10), pp. 2418-2425. Date of Electronic Publication: 2018 Jan 25.
DOI: 10.1002/chem.201705127
Abstrakt: Shell thickness dependent band-gap engineering of quasi type II core-shell material with higher carrier cooling time, lower interfacial defect states, and longer charge carrier recombination time can be a promising candidate for both photocatalysis and solar cell. In the present investigation, colloidal CdSe@CdS core-shells with different shell thickness (2, 4 and 6 monolayer CdS) were synthesized through hot injection method and have been characterized by high resolution transmission electron microscope (HRTEM) followed by steady state absorption and luminescence techniques. Ultrafast transient absorption (TA) studies suggest longer carrier cooling, lower interfacial surface states, and slower carrier recombination time in CdSe@CdS core-shell with increasing shell thickness. By TA spectroscopy, the role of CdS shell in power conversion efficiency (PCE) has been explained in detail. The measured PCE was found to initially increase and then decrease with increasing shell thickness. Shell thickness has been optimized to maximize the efficiency after correlating the shell controlled carrier cooling and recombination with PCE values and a maximum PCE of 3.88 % was obtained with 4 monolayers of CdS shell, which is found to be 57 % higher than compared to bare CdSe QDs.
(© 2018 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.)
Databáze: MEDLINE
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