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Record 21 of 6489
Novel High Efficient Organic Photovoltaic Materials
Availability: Available in document 20020018881 on p. 30, or for help Contact the Information Desk
Author and Affiliation:
Sun, Sam(Norfolk State Univ., Center for Materials Research, VA United States)
Haliburton, James(Norfolk State Univ., Center for Materials Research, VA United States)
Fan, Zben(Norfolk State Univ., Center for Materials Research, VA United States)
Taft, Charles(Norfolk State Univ., Center for Materials Research, VA United States)
Wang, Yi-Qing(Norfolk State Univ., Center for Materials Research, VA United States)
Maaref, Shahin(Norfolk State Univ., Center for Materials Research, VA United States)
Mackey, Willie R. [Technical Monitor]
Abstract: In man's mission to the outer space or a remote site, the most abundant, renewable, nonpolluting, and unlimited external energy source is light. Photovoltaic (PV) materials can convert light into electrical power. In order to generate appreciable electrical power in space or on the Earth, it is necessary to collect sunlight from large areas due to the low density of sunlight, and this would be very costly using current commercially available inorganic solar cells. Future organic or polymer based solar cells seemed very attractive due to several reasons. These include lightweight, flexible shape, ultra-fast optoelectronic response time (this also makes organic PV materials attractive for developing ultra-fast photo detectors), tunability of energy band-gaps via molecular design, versatile materials synthesis and device fabrication schemes, and much lower cost on large-scale industrial production. It has been predicted that nano-phase separated block copolymer systems containing electron rich donor blocks and electron deficient acceptor blocks will facilitate the charge separation and migration due to improved electronic ultrastructure and morphology in comparison to current polymer composite photovoltaic system. This presentation will describe our recent progress in the design, synthesis and characterization of a novel donor-bridge-acceptor block copolymer system for potential high-efficient organic optoelectronic applications. Specifically, the donor block contains an electron donating alkyloxy derivatized polyphenylenevinylene, the acceptor block contains an electron withdrawing alkyl-sulfone derivatized polyphenylenevinylene, and the bridge block contains an electronically neutral non-conjugated aliphatic hydrocarbon chain. The key synthetic strategy includes the synthesis of each individual block first, then couple the blocks together. While the donor block stabilizes the holes, the acceptor block stabilizes the electrons. The bridge block is designed to hinder the electron-hole recombination. Thus, improved charge separation is expected. In addition, charge migration will also be facilitated due to the expected nano-phase separated and highly ordered block copolymer ultrastructural. The combination of all these factors will result in significant overall enhancement of photovoltaic power conversion efficiency.
Publication Date: Nov 01, 2001
Document ID:
20020018903
(Acquired Feb 15, 2002)
Subject Category: ENERGY PRODUCTION AND CONVERSION
Report/Patent Number: P22
Document Type: Conference Paper
Publication Information: SEE parent document record, "HBCUs/OMUs Research Conference Agenda and Abstracts"; p. 30; NASA/TM-2001-211289
Financial Sponsor: NASA Glenn Research Center; Cleveland, OH United States
Organization Source: Norfolk State Univ.; Center for Materials Research; VA United States
Description: 1p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: No Copyright
NASA Terms: PHOTOVOLTAIC CONVERSION; ORGANIC MATERIALS; SOLAR CELLS; POWER EFFICIENCY; ACCEPTOR MATERIALS; HOLES (ELECTRON DEFICIENCIES); POLARIZATION (CHARGE SEPARATION); BLOCK COPOLYMERS
Availability Notes: Abstract Only; Available from STI Support Services only as part of the entire parent document
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