Role of Polymer in Hybrid Polymer/PbS Quantum Dot Solar Cells
2015 (English)In: The Journal of Physical Chemistry C, ISSN 1932-7447, E-ISSN 1932-7455, Vol. 119, no 27, 14972-14979 p.Article in journal (Refereed) Published
Hybrid nanocomposites (HCs) obtained by blend solutions of conjugated polymers and colloidal semiconductor nanocrystals are among the most promising materials to be exploited in solution-processed photovoltaic applications. The comprehension of the operating principles of solar cells based on HCs thus represents a crucial step toward the rational engineering of high performing photovoltaic devices. Here we investigate the effect of conjugated polymers on hybrid solar cell performances by taking advantage from an optimized morphology of the HCs comprising lead sulfide quantum dots (PbS QDs). Uncommonly, we find that larger photocurrent densities are achieved by HCs incorporating wide-bandgap polymers. A combination of spectroscopic and electro-optical measurements suggests that wide-bandgap polymers promote efficient charge/exciton transfer processes and hinder the population of midgap states on PbS QDs. Our linings underline the key role of the polymer in HC-based solar cells in the activation/deactivation of charge transfer/loss pathways.
Place, publisher, year, edition, pages
American Chemical Society , 2015. Vol. 119, no 27, 14972-14979 p.
IdentifiersURN: urn:nbn:se:liu:diva-120451DOI: 10.1021/acs.jpcc.5b03761ISI: 000357964900018OAI: oai:DiVA.org:liu-120451DiVA: diva2:845600
Funding Agencies|Progetto di ricerca PON RC [713/Ric. del 29]; MAAT-Molecular NAnotechnology for HeAlth and EnvironmenT [PON02_00563_3316357]; EFOR-Energia da FOntiRinnovabili (Iniziativa CNR per il Mezzogiorno L.) [191/2009]; project Beyond-Nano [PON03_00362]; Knut and Alice Wallenberg foundation2015-08-122015-08-112015-08-12