NDLI: Achieving fill factor above 80% in organic solar cells by charged interface

Content Provider	IEEE Xplore Digital Library
Author	Ray, Biswajit Alam, Muhammad Ashraful
Copyright Year	2012
Description	Author affiliation: School of Electrical and Computer Engineering, Purdue University, West Lafayette, IN 47906, USA (Ray, Biswajit; Alam, Muhammad Ashraful)
Abstract	Poor carrier mobility in organic semiconductors and high free carrier recombination at the polymer interfaces hinder efficient collection of photogenerated carriers in organic photovoltaic (OPV) devices. This inefficiency in charge collection is reflected in the low fill factor (FF) of the OPV cells $(FF^{OPV}$ ∼ 65%) compared with its inorganic counterparts (FF ∼ 85%). In this paper, we show that the FF of the OPV devices made of the conventional low-mobility materials can be radically improved (>80%) by introducing a “fixed charge layer” at the donor-acceptor interfaces. We find that the fixed charges prevent free-carrier accumulation at the interface and, hence, minimize charge loss due to interfacial recombination. We use detailed device simulation to estimate the fixed charge density required for significant performance gain in typical P3HT:PCBM cells. We conclude by suggesting several strategies for introducing such charged interfaces within the conventional OPV device structure.
Starting Page	1
Ending Page	8
File Size	5033987
Page Count	8
File Format	PDF
DOI	10.1109/PVSC-Vol2.2012.6656773
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2012-06-03
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Radiative recombination Excitons Photoconductivity Materials Heterojunctions Photovoltaic cells organic photovoltaic (OPV) cell Bulk heterojunction (BHJ) fill factor (FF) interfacial charge recombination
Content Type	Text
Resource Type	Article

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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