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Photovoltaic cells made from conjuga...

Coakley, Kevin M.

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Photovoltaic cells made from conjugated polymers infiltrated into ordered nanoporous hosts.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Photovoltaic cells made from conjugated polymers infiltrated into ordered nanoporous hosts./
Author:	Coakley, Kevin M.
Description:	92 p.
Notes:	Source: Dissertation Abstracts International, Volume: 65-11, Section: B, page: 5978.
Contained By:	Dissertation Abstracts International65-11B.
Subject:	Engineering, Materials Science. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3153023
ISBN:	049613468X

Photovoltaic cells made from conjugated polymers infiltrated into ordered nanoporous hosts.
Coakley, Kevin M.

Photovoltaic cells made from conjugated polymers infiltrated into ordered nanoporous hosts. - 92 p.

Source: Dissertation Abstracts International, Volume: 65-11, Section: B, page: 5978.

Thesis (Ph.D.)--Stanford University, 2005.

Semiconducting (conjugated) polymers have several properties which make them ideal candidates for use in low-cost photovoltaic (PV) cells, including their typically high (105 cm-1) optical absorption coefficients, their ability to be cast from solution using a variety of wet-processing techniques, and the ability to tune their band gap. While most approaches for making conjugated polymer-based PV cells involve randomly intermixing the polymers with electron acceptors that act as sites for exciton dissociation, we have sought to obtain a more optimized morphology of the blended materials through a self-assembly technique. In the first half of this dissertation, we describe our preliminary attempts to make PV cells from conjugated polymers infiltrated into a self-assembled mesoporous titanic (TiO 2) electron acceptor that is ordered on the nanometer length scale. We first present a procedure for fabricating films of mesoporous TiO 2 and then show how its pores can be filled with a conjugated polymer, regioregular poly(3-hexylthiophene) (P3HT). In these films we have achieved precise control of the morphology of the two materials that has not yet been achieved elsewhere. However, as discussed subsequently, the photovoltaic performance of these films has not yet reached the level achieved by other types of conjugated polymer-based PV cells, with a maximum achieved power efficiency of approximately 0.45%.

ISBN: 049613468XSubjects--Topical Terms:

1017759
Engineering, Materials Science.

Photovoltaic cells made from conjugated polymers infiltrated into ordered nanoporous hosts.
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245 1 0 $a Photovoltaic cells made from conjugated polymers infiltrated into ordered nanoporous hosts.
300 $a 92 p.
500 $a Source: Dissertation Abstracts International, Volume: 65-11, Section: B, page: 5978.
500 $a Adviser: Michael D. McGehee.
502 $a Thesis (Ph.D.)--Stanford University, 2005.
520 $a Semiconducting (conjugated) polymers have several properties which make them ideal candidates for use in low-cost photovoltaic (PV) cells, including their typically high (105 cm-1) optical absorption coefficients, their ability to be cast from solution using a variety of wet-processing techniques, and the ability to tune their band gap. While most approaches for making conjugated polymer-based PV cells involve randomly intermixing the polymers with electron acceptors that act as sites for exciton dissociation, we have sought to obtain a more optimized morphology of the blended materials through a self-assembly technique. In the first half of this dissertation, we describe our preliminary attempts to make PV cells from conjugated polymers infiltrated into a self-assembled mesoporous titanic (TiO 2) electron acceptor that is ordered on the nanometer length scale. We first present a procedure for fabricating films of mesoporous TiO 2 and then show how its pores can be filled with a conjugated polymer, regioregular poly(3-hexylthiophene) (P3HT). In these films we have achieved precise control of the morphology of the two materials that has not yet been achieved elsewhere. However, as discussed subsequently, the photovoltaic performance of these films has not yet reached the level achieved by other types of conjugated polymer-based PV cells, with a maximum achieved power efficiency of approximately 0.45%.
520 $a In the second half of this dissertation, we embark on a more fundamental study of the materials requirements for efficient polymer photovoltaics, including models that show how the maximum achievable power efficiency is limited by energy loss during forward electron transfer, and how the maximum achievable photocurrent is limited by the limiting carrier mobility and back electron transfer. Our modeling suggests that, for a back recombination time constant of 1 mus, a limiting carrier mobility of 10-3--10 -2 cm2/Vs is required in order to achieve a large photocurrent across a fairly broad range of absorbed wavelengths. We then show how these mobility values can be achieved in a conjugated polymer through the vertical alignment of the chains of the polymer with respect to the plane of the substrate. These measurements were performed by infiltrating P3HT into a vertical-channel anodic alumina template.
590 $a School code: 0212.
650 4 $a Engineering, Materials Science. $3 1017759
650 4 $a Engineering, Electronics and Electrical. $3 626636
650 4 $a Chemistry, Polymer. $3 1018428
650 4 $a Energy. $3 876794
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690 $a 0495
690 $a 0791
710 2 0 $a Stanford University. $3 754827
773 0 $t Dissertation Abstracts International $g 65-11B.
790 1 0 $a McGehee, Michael D., $e advisor
790 $a 0212
791 $a Ph.D.
792 $a 2005
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3153023