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Materials for controlling the epitaxial growth of photoactive layers in photovoltaic devices

Patent ·
OSTI ID:1860217
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There is disclosed ultrathin film material templating layers that force the morphology of subsequently grown electrically active thin films have been found to increase the performance of small molecule organic photovoltaic (OPV) cells. There is disclosed electron-transporting material, such as hexaazatriphenylene-hexacarbonitrile (HAT-CN) can be used as a templating material that forces donor materials, such as copper phthalocyanine (CuPc) to assume a vertical-standing morphology when deposited onto its surface on an electrode, such as an indium tin oxide (ITO) electrode. It has been shown that for a device with HAT-CN as the templating buffer layer, the fill factor and short circuit current of CuPc:C60 OPVs were both improved compared with cells lacking the HAT-CN template. This is explained by the reduction of the series resistance due to the improved crystallinity of CuPc grown onto the ITO surface.
Research Organization:
University of Michigan, Ann Arbor, MI (United States); Dankook University, Guepmgoo (South Korea). Industry-Academic Cooperation Foundation
Sponsoring Organization:
USDOE
DOE Contract Number:
SC0000957
Assignee:
The Regents of the University of Michigan (Ann Arbor, MI); Industry-Academic Cooperation Foundation Dankook University (Guepmgoo, KR)
Patent Number(s):
11,211,559
Application Number:
13/273,753
OSTI ID:
1860217
Country of Publication:
United States
Language:
English

References (11)

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Growth Process of Phthalocyanine Films Deposited on 3,4,9,10-Perylene Tetracarboxylic Dianhydride Template Layers journal January 2006
Tandem Organic Light-Emitting Diode using Hexaazatriphenylene Hexacarbonitrile in the Intermediate Connector journal January 2008
The role of energy level matching in organic solar cells—Hexaazatriphenylene hexacarbonitrile as transparent electron transport material journal March 2011
Formation of Organic Crystalline Nanopillar Arrays and Their Application to Organic Photovoltaic Cells journal December 2010
Controlled growth of a molecular bulk heterojunction photovoltaic cell journal December 2004
Vertical orientation of copper phthalocyanine in organic solar cells using a small molecular weight organic templating layer journal July 2011

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