Thumbnail
Access Restriction
Open

Author Nenashev, A. V. ♦ Dvurechenskii, A. V. ♦ Wiemer, M. ♦ Gebhard, F. ♦ Koch, M. ♦ Baranovskii, S. D.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS ♦ CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY ♦ CHARGE CARRIERS ♦ CONCENTRATION RATIO ♦ ELECTRONS ♦ FULLERENES ♦ HETEROJUNCTIONS ♦ HOLES ♦ INTERFACES ♦ ORGANIC SOLAR CELLS ♦ PHOTOVOLTAIC EFFECT ♦ POLYMERS ♦ RECOMBINATION ♦ TOPOLOGY
Abstract The apparent order δ of non-geminate recombination higher than δ = 2 has been evidenced in numerous experiments on organic bulk heterojunction (BHJ) structures intensively studied for photovoltaic applications. This feature is claimed puzzling, since the rate of the bimolecular recombination in organic BHJ systems is proportional to the product of the concentrations of recombining electrons and holes and therefore the reaction order δ = 2 is expected. In organic BHJ structures, electrons and holes are confined to two different material phases: electrons to the acceptor material (usually a fullerene derivative) while holes to the donor phase (usually a polymer). The non-geminate recombination of charge carriers can therefore happen only at the interfaces between the two phases. Considering a simple geometrical model of the BHJ system, we show that the apparent order of recombination can deviate from δ = 2 due solely to the topological structure of the system.
ISSN 00036951
Educational Use Research
Learning Resource Type Article
Publisher Date 2016-07-18
Publisher Place United States
Journal Applied Physics Letters
Volume Number 109
Issue Number 3


Open content in new tab

   Open content in new tab