Issue 39, 2013
From the journal:

Physical Chemistry Chemical Physics

Solution-processed small molecule:fullerene bulk-heterojunction solar cells: impedance spectroscopy deduced bulk and interfacial limits to fill-factors†

Antonio Guerrero,‡a   Stephen Loser,‡b   Germà Garcia-Belmonte,a   Carson J. Bruns,cd   Jeremy Smith,b   Hiroyuki Miyauchi,b   Samuel I. Stupp,cd   Juan Bisquert*a  and  Tobin J. Marks*b  

* Corresponding authors

a Photovoltaic and Optoelectronic Devices Group, Departament de Física, Universitat Jaume I, ES-12071 Castelló, Spain
E-mail: bisquert@uji.es

b Department of Chemistry and the Argonne-Northwestern Solar Energy Research (ANSER) Center, Northwestern University, 2145 Sheridan Road, Evanston, IL 60208, USA
E-mail: t-marks@northwestern.edu
Tel: +1 847-491-5652

c Department of Chemistry, Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, USA

d Department of Medicine and the Institute for BioNanotechnology in Medicine, Northwestern University, Chicago, Illinois 60611, USA

Abstract

Using impedance spectroscopy, we demonstrate that the low fill factor (FF) typically observed in small molecule solar cells is due to hindered carrier transport through the active layer and hindered charge transfer through the anode interfacial layer (IFL). By carefully tuning the active layer thickness and anode IFL in BDT(TDPP)2 solar cells, the FF is increased from 33 to 55% and the PCE from 1.9 to 3.8%. These results underscore the importance of simultaneously optimizing active layer thickness and IFL in small molecule solar cells.

Graphical abstract: Solution-processed small molecule:fullerene bulk-heterojunction solar cells: impedance spectroscopy deduced bulk and interfacial limits to fill-factors

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Article information

DOI
https://doi.org/10.1039/C3CP52363B
Article type
Communication
Submitted
24 Jun 2013
Accepted
23 Jul 2013
First published
23 Jul 2013

Phys. Chem. Chem. Phys., 2013,15, 16456-16462

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Solution-processed small molecule:fullerene bulk-heterojunction solar cells: impedance spectroscopy deduced bulk and interfacial limits to fill-factors

A. Guerrero, S. Loser, G. Garcia-Belmonte, C. J. Bruns, J. Smith, H. Miyauchi, S. I. Stupp, J. Bisquert and T. J. Marks, Phys. Chem. Chem. Phys., 2013, 15, 16456 DOI: 10.1039/C3CP52363B

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