التفاصيل البيبلوغرافية
| العنوان: |
Organic solar cells : novel materials, charge transport and plasmonic studies |
| المؤلفون: |
Ebenhoch, Bernd |
| المساهمون: |
Samuel, Ifor D. W. |
| بيانات النشر: |
University of St Andrews, 2015. |
| سنة النشر: |
2015 |
| المجموعة: |
University of St Andrews |
| مصطلحات موضوعية: |
621.31, Solution-processed solar cells, Low-band gap BBT-DPP polymer, Subphthalocyanine derivatives as electron acceptors, Charge transport and device physics, Influence of additive (DIO) on bulk-heterojunction morphology, Enhanced absorption by plasmonic structures, TK2960.E3, Solar cells--Materials, Organic semiconductors, Charge transfer |
| الوصف: |
Organic solar cells have great potential for cost-effective and large area electricity production, but their applicability is limited by the relatively low efficiency. In this dissertation I report investigations of novel materials and the underlying principles of organic solar cells, carried out at the University of St Andrews between 2011 and 2015. Key results of this investigation: • The charge carrier mobility of organic semiconductors in the active layer of polymer solar cells has a rather small influence on the power conversion efficiency. Cooling solar cells of the polymer:fullerene blend PTB7:PC₇₁BM from room temperature to 77 K decreased the hole mobility by a factor of thousand but the device efficiency only halved. • Subphthalocyanine molecules, which are commonly used as electron donor materials in vacuum-deposited active layers of organic solar cells, can, by a slight structural modification, also be used as efficient electron acceptor materials in solution-deposited active layers. Additionally these acceptors offer, compared to standard fullerene acceptors,advantages of a stronger light absorption at the peak of the solar spectrum. • A low band-gap polymer donor material requires a careful selection of the acceptor material in order to achieve efficient charge separation and a maximum open circuit voltage. • Metal structures in nanometer-size can efficiently enhance the electric field and light absorption in organic semiconductors by plasmonic resonance. The fluorescence of a P3HT polymer film above silver nanowires, separated by PEDOT:PSS, increased by factor of two. This could be clearly assigned to an enhanced absorption as the radiative transition of P3HT was identical beside the nanowires. • The use of a processing additive in the casting solution for the active layer of organic solar cells of PTB7:PC₇₁BM strongly influences the morphology, which leads not only to an optimum of charge separation but also to optimal charge collection. |
| نوع الوثيقة: |
Electronic Thesis or Dissertation |
| اللغة: |
English |
| URL الوصول: |
http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.675206 |
| رقم الانضمام: |
edsble.675206 |
| قاعدة البيانات: |
British Library EThOS |