Bulk heterojunction (BHJ) solar cells based on polymer/fullerene blends have attracted much attention over the last decade, leading to a breakthrough in power conversion efficiency (PCE) over 10%. Several strategies are currently being pursued to achieve higher PCE, while most conjugated polymers have an intense, but rather narrow absorption band. An attractive method to broaden the absorption bandwidth is to blend near infrared (near IR) sensitizers into the host donor:acceptor binary blend system. Among them, dye molecules are the most widely used. This dissertation targets on the synthesis of novel dye molecules and fabricating of high efficiency ternary solar cells with absorption ranges extending into the near IR region. The first part of this thesis focuses on design and synthesis of silicon phthalocyanines (SiPCs) and naphthalocyanine (SiNC) to open the possibility to modify the chemical, electronic and optical properties. Hence, a novel series of SiPCs (SiPC-0, SiPC-1, SiPC-2, and SiPC-3) with varying the length of alkyl chain between the pyrene ring and PC ring, and SiNC-1 by extending the π-system structure were synthesized according to a simple method and characterized. The electronic and optical properties of all new compounds were investigated separately by using cyclic voltammetry and UV-vis absorption spectroscopy methods. Near IR absorption feature and suitable band gap (Egap) give these molecules great potential to implement them in ternary or quaternary organic solar cells as dye sensitizers. The second part of this thesis focuses on study of the relationship between materials’ structure with their physical properties and with device application. Introducing SiPC compounds into P3HT/PCBM matrix, all sensitizers showed a strong photosensitivity in the near IR region and notable improvement for all performance parameters of the ternary solar cells as compared to the reference binary device. The incorporation of SiPC-3 resulted in an increase of up to 21.9% of short-circuit current density (JSC), ...
A Series of Novel Silicon Phthalocyanines/ Naphthalocyanine as Near Infrared Sensitizers in Organic Ternary and Quaternary Solar Cells ; Eine Reihe von neuartigen Silizium-Phthalocyaninen/ Naphthalocyaninen als Nahinfrarot-Sensibilisatoren in ternären und quaternären organischen Solarzellen
2017-01-01
Theses
Electronic Resource
English
DDC: | 629 |
Automotive engineering | 2006
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