Plight of Mn Doping in Colloidal CdS Quantum Dots To Boost the Efficiency of Solar Cells

Autor:	Sayan Bhattacharyya, Ganga Halder
Rok vydání:	2015
Předmět:	Materials science business.industry Doping Electrolyte Surfaces Coatings and Films Electronic Optical and Magnetic Materials Ion Colloid General Energy Quantum dot Optoelectronics Mn doping Charge carrier Physical and Theoretical Chemistry business Recombination
Zdroj:	The Journal of Physical Chemistry C. 119:13404-13412
ISSN:	1932-7455 1932-7447
DOI:	10.1021/acs.jpcc.5b01932
Popis:	One of the strategies to boost the efficiency of highly promising yet struggling quantum dot solar cells (QDSCs) is to dope the QDs with optically active Mn2+ ions to create long-lived charge carriers and reduce the electron–hole recombination. The in situ deposition of QDs although offers good surface coverage and better charge separation; in “doped” QDSCs the type of doping responsible for higher efficiencies cannot be ascertained. In the electrophoretically deposited Mn:CdS QDSCs, highest lattice doping of Mn2+ ions in presynthesized colloidal CdS QDs results in the highest efficiency, whereas exchange coupled Mn2+–Mn2+ pairs increase nonradiative electron–hole recombination and decrease the efficiency of QDSCs. With Mn:Cd at. % of 1.44, the efficiency could be increased to 2.1% as compared to 1.3% for CdS QDSC. The increase in efficiency by 66.4% is due to slower charge recombination in the photoanode and the electrolyte interface and higher electron lifetime in the doped QDSCs.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::7080771a5dfa3217d6dde367d55da6c5 https://doi.org/10.1021/acs.jpcc.5b01932 Zobrazit plný text záznamu