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Structural and photophysical conside...

Ryerson, Joseph L.

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Structural and photophysical considerations of singlet fission organic thin films for solar photochemistry.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Structural and photophysical considerations of singlet fission organic thin films for solar photochemistry./
Author:	Ryerson, Joseph L.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2016,
Description:	147 p.
Notes:	Source: Dissertation Abstracts International, Volume: 78-03(E), Section: B.
Contained By:	Dissertation Abstracts International78-03B(E).
Subject:	Physical chemistry. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10151085
ISBN:	9781369058499

Structural and photophysical considerations of singlet fission organic thin films for solar photochemistry.
Ryerson, Joseph L.

Structural and photophysical considerations of singlet fission organic thin films for solar photochemistry. - Ann Arbor : ProQuest Dissertations & Theses, 2016 - 147 p.

Source: Dissertation Abstracts International, Volume: 78-03(E), Section: B.

Thesis (Ph.D.)--University of Colorado at Boulder, 2016.

Singlet fission (SF) is a multichromophore charge multiplication process in organic systems in which a singlet exciton shares its energy with a neighboring chromophore, thus generating two triplet excitons from one photon. SF chromophores can boost photocurrent in solar cells, raising the maximum theoretical power conversion efficiency of a single-junction solar cell from &sim;33% to &sim;45. Thin film (TF) preparation techniques, steady-state and time-resolved spectroscopic methods, and numerous advanced calculations were used to study the three systems presented here, all of which exhibit polymorphism.

ISBN: 9781369058499Subjects--Topical Terms:

1981412
Physical chemistry.

Structural and photophysical considerations of singlet fission organic thin films for solar photochemistry.
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100 1 $a Ryerson, Joseph L. $3 3281084
245 1 0 $a Structural and photophysical considerations of singlet fission organic thin films for solar photochemistry.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2016
300 $a 147 p.
500 $a Source: Dissertation Abstracts International, Volume: 78-03(E), Section: B.
500 $a Adviser: Arthur Nozik.
502 $a Thesis (Ph.D.)--University of Colorado at Boulder, 2016.
520 $a Singlet fission (SF) is a multichromophore charge multiplication process in organic systems in which a singlet exciton shares its energy with a neighboring chromophore, thus generating two triplet excitons from one photon. SF chromophores can boost photocurrent in solar cells, raising the maximum theoretical power conversion efficiency of a single-junction solar cell from &sim;33% to &sim;45. Thin film (TF) preparation techniques, steady-state and time-resolved spectroscopic methods, and numerous advanced calculations were used to study the three systems presented here, all of which exhibit polymorphism.
520 $a TFs of 1,3-diphenylisobenzofuran (1), were prepared and two polymorphs, alpha1 and beta-1, were discovered and characterized. alpha-1films exhibit phiTnear 200% and low phiF, whereas the dominant photophysical processes in the beta-1 polymorph are prompt and excimer emissions, with phi T around 10%. Absorption fitting revealed that the S1 state of beta-1 is lower than alpha-1, and therefore SF and the correlated triplet 1(TT) is energetically inaccessible to beta-1. The SF mechanism in TFs of each polymorph is outlined in great detail.
520 $a Polymorphism in tetracene (Tc), a near 200% phiT SF material, has been previously documented, although morphology considerations have been neglected. While crystallite size has been shown to affect dynamics, the two Tc polymorphs, I and II, have not been analyzed in a thorough comparison of dynamics and photophysics. Tc II films show SF rates that are independent of crystallite size and SF occurs more rapidly than in Tc I. The slower Tc I SF rates are highly dependent on grain size. Coupling calculations suggested that Tc I should be faster, but these calculations are limited, and more sophisticated, multimolecule calculations are needed to support experimental results.
520 $a Two extremely stable indigo derivatives, Cibalackrot (2) and a tert-butylated derivative(3) were structurally and photophysically characterized in solution and in TFs. Two crystalline polymorphs ( 2alpha, 2beta) and an amorphous phase (2a), as well as a crystalline (3alpha) and amorphous (3a) phase of 3 were deposited by thermal evaporation. phiT values of less than 25% were observed for all morphologies, except in 2beta(phi T= 50%). Excimer formation dominates relaxation pathways in TFs of 2 and 3.
590 $a School code: 0051.
650 4 $a Physical chemistry. $3 1981412
650 4 $a Materials science. $3 543314
650 4 $a Chemistry. $3 516420
690 $a 0494
690 $a 0794
690 $a 0485
710 2 $a University of Colorado at Boulder. $b Chemistry. $3 1019559
773 0 $t Dissertation Abstracts International $g 78-03B(E).
790 $a 0051
791 $a Ph.D.
792 $a 2016
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10151085