Nanoscale structure, dynamics and power conversion efficiency correlations in small molecule and oligomer-based photovoltaic devices

Nano Reviews & Experiments

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Title Nanoscale structure, dynamics and power conversion efficiency correlations in small molecule and oligomer-based photovoltaic devices
 
Creator Szarko, Jodi M.; Northwestern University
Guo, Jianchang; The University of Chicago
Rolczynski, Brian S.; Northwestern University
Chen, Lin X.; Argonne National Laboratory/Northwestern University
 
Subject Organic photovoltaic; organic solar cells; grazing incident x-ray scatterning; pi-conjugated polymers
 
Description Photovoltaic functions in organic materials are intimately connected to interfacial morphologies of molecular packing in films on the nanometer scale and molecular levels. This review will focus on current studies on correlations of nanoscale morphologies in organic photovoltaic (OPV) materials with fundamental processes relevant to photovoltaic functions, such as light harvesting, exciton splitting, exciton diffusion, and charge separation (CS) and diffusion. Small molecule photovoltaic materials will be discussed here. The donor and acceptor materials in small molecule OPV devices can be fabricated in vacuum-deposited, multilayer, crystalline thin films, or spincoated together to form blended bulk heterojunction (BHJ) films. These two methods result in very different morphologies of the solar cell active layers. There is still a formidable debate regarding which morphology is favored for OPV optimization. The morphology of the conducting films has been systematically altered; using variations of the techniques above, the whole spectrum of film qualities can be fabricated. It is possible to form a highly crystalline material, one which is completely amorphous, or an intermediate morphology. In this review, we will summarize the past key findings that have driven organic solar cell research and the current state-of-the-art of small molecule and conducting oligomer materials. We will also discuss the merits and drawbacks of these devices. Finally, we will highlight some works that directly compare the spectra and morphology of systematically elongated oligothiophene derivatives and compare these oligomers to their polymer counterparts. We hope this review will shed some new light on the morphology differences of these two systems.Keywords: organic photovoltaics; perylene; thiophene; charge transport; transient absorption; grazing incidence x-ray scattering(Published: 12 August 2011)Citation: Nano Reviews 2011, 2: 7249 - DOI: 10.3402/nano.v2i0.7249
 
Publisher Co-Action Publishing
 
Contributor U.S. Department of Energy, Basic Energy Science, Intel Corp.
 
Date 2011-08-12
 
Type info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion

 
Format application/pdf
text/html
application/epub+zip
text/xml
 
Identifier http://www.nanoreviewsexperiments.net/index.php/nano/article/view/7249
10.3402/nr.v2i0.7249
 
Source Nano Reviews & Experiments; Vol 2 (2011) incl Supplements
2002-2727
 
Language eng
 
Relation http://www.nanoreviewsexperiments.net/index.php/nano/article/view/7249/9922
http://www.nanoreviewsexperiments.net/index.php/nano/article/view/7249/9924
http://www.nanoreviewsexperiments.net/index.php/nano/article/view/7249/9925
http://www.nanoreviewsexperiments.net/index.php/nano/article/view/7249/9923
 

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