Basic aspects for improving the energy conversion efficiency of hetero-junction organic photovoltaic cells

Nano Reviews & Experiments

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Title Basic aspects for improving the energy conversion efficiency of hetero-junction organic photovoltaic cells
 
Creator Ryuzaki, Sou; Research Laboratory for Nuclear Reactors, Tokyo Institute of Technology,
Onoe, Jun; Research Laboratory for Nuclear Reactors, Tokyo Institute of Technology,
 
Subject Crystalline; molecular orientation; external quantum efficiency; intra- and inter-molecular excitons; open-circuit voltage; built-in potential
 
Description Hetero-junction organic photovoltaic (OPV) cells consisting of donor (D) and acceptor (A) layers have been regarded as next-generation PV cells, because of their fascinating advantages, such as lightweight, low fabrication cost, resource free, and flexibility, when compared to those of conventional PV cells based on silicon and semiconductor compounds. However, the power conversion efficiency (h) of the OPV cells has been still around 8%, though more than 10% efficiency has been required for their practical use. To fully optimize these OPV cells, it is necessary that the low mobility of carriers/excitons in the OPV cells and the open circuit voltage (VOC), of which origin has not been understood well, should be improved. In this review, we address an improvement of the mobility of carriers/excitons by controlling the crystal structure of a donor layer and address how to increase the VOC for zinc octaethylporphyrin [Zn(OEP)]/ C60 hetero-junction OPV cells [ITO/Zn(OEP)/C60/Al]. It was found that crystallization of Zn(OEP) films increases the number of inter-molecular charge transfer (IMCT) excitons and enlarges the mobility of carriers and IMCT excitons, thus significantly improving the external quantum efficiency (EQE) under illumination of the photoabsorption band due to the IMCT excitons. Conversely, charge accumulation of photo-generated carriers in the vicinity of the donor/ acceptor (D/A) interface was found to play a key role in determining the VOC for the OPV cells.Keywords: Crystalline; molecular orientation; external quantum efficiency; intra- and inter-molecular excitons; open-circuit voltage; built-in potential(Published: 10 July 2013)Citation: Nano Reviews 2013, 4: 21055 - http://dx.doi.org/10.3402/nano.v4i0.21055
 
Publisher Co-Action Publishing
 
Contributor
 
Date 2013-07-10
 
Type info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion

 
Format application/pdf
text/html
application/epub+zip
text/plain
 
Identifier http://www.nanoreviewsexperiments.net/index.php/nano/article/view/21055
10.3402/nr.v4i0.21055
 
Source Nano Reviews & Experiments; Vol 4 (2013) incl Supplements
2002-2727
 
Language eng
 
Relation http://www.nanoreviewsexperiments.net/index.php/nano/article/view/21055/28834
http://www.nanoreviewsexperiments.net/index.php/nano/article/view/21055/28835
http://www.nanoreviewsexperiments.net/index.php/nano/article/view/21055/28836
http://www.nanoreviewsexperiments.net/index.php/nano/article/view/21055/28837
 

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