A master thesis from Aalborg University
Organic solar cells - Design, Synthesis, and characterization of a novel electron acceptor
[Organiske solceller - design, syntese og karakterisering af ny elektronaccepter]
Author(s)
Term
4. term
Education
Publication year
2010
Submitted on
2010-08-05
Pages
66 pages
Abstract
Dette speciale havde til hensigt at udvikle en lav band gap ny elektron accepter oligomer med forbedret elektrontransport og -accepter egenskaber. Ved at påsætte elektron tiltrækkende grupper på thiophen påsat en allerede kendt elektron accepter kerne valgt på basis af band gaps af kendte molekyler også ud fra LUMO niveauet placering for at maksimere sol cellens præstation. N,N’-bis(2,2’-octyldodecyl)-naphthalen-1,8,4,5- bis(dicarboximid) og 3,3’dinitro-2,2’-dithiophen var valgt som elektron accepter kernen and side kæderne respektivt. Slut molekylet kunne ikke blive syntetiseret på grnd af problemer med dannelsen af 2-octyldodecyl-1-amin og Stille koblings reagent. N,N’-bisoctyl-2,6-dithiophenenaphthalen- 1,8,4,5-bis(dicarboximid) blev fremskaffet ved Stille kobling. Dets egenskaber blev testet ved UV/vis spektroskopi og i en organisk sol celle med Poly(3-hexylthiophene) som elektron donor. En effektivitet på 0.084% blev opnået, apparaterne blev annealet, hvilket medførte et fald i effektivitet til to 0.055%.
This master thesis had the intent to develop a low band gap novel electron accepter oligomer with improved electron transport and acceptance properties. By adding electron withdrawing groups onto thiophenes linked to a known electron accepter core selected on the basis of band gaps of already prepared molecules as well as the position of the LUMO level in order to maximize solar cells performance. N,N’-bis(2,2’-octyldodecyl)-naphthalene-1,8,4,5- bis(dicarboximide) and 3,3’dinitro-2,2’- dithiophene were chosen as the electron accepter core and side chain respectively. The end molecule could not be synthesized due to problem with the formation of 2-octyldodecyl-1- amine and Stille coupling reagent. N,N’-bisoctyl-2,6-dithiophenenaphthalene- 1,8,4,5-bis(dicarboximide) was obtained by Stille coupling. Its properties were tested with UV/vis spectroscopy and in organic solar cells with Poly(3-hexylthiophene) as electron donor. An efficiency of 0.084 % was obtained, the device was annealed which let to a decrease in efficiency to 0.055%.
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