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Development of polymer–fullerene solar cells

National Science Review 2016年第2期3卷 222-239页

作者： Fengling Zhang Olle Ingans Yinhua Zhou koen vandewal Biomolecular and organic electronics Department of PhysicsChemistry and Biology(IFM)Linkoping University Wuhan National Laboratory for Optoelectronics Huazhong University of Science and Technology Institut fr Angewandte Photophysik Technische Universitt Dresden

Global efforts and synergetic interdisciplinary collaborations on solution-processed bulk-heterojunction polymer solar cells(PSCs or OPVs) made power conversion efficiencies over 10%*** rapid progress of the field is credited to the synthesis of a large number of novel polymers with specially tunable optoelectronic properties,a better control over the nano-morphology of photoactive blend layers,the introduction of various effective interfacial layers,new device architectures and a deeper understanding of device *** will review the pioneering materials for polymer-fullerene solar cells and trace the progress of concepts driving their *** discuss the evolution of morphology control,interfacial layers and device structures fully exploring the potential of photoactive *** order to guide a further increase in power conversion efficiency of OPV,the current understanding of the process of free charge carrier generation and the origin of the photovoltage is summarized followed by a perspective on how to overcome the limitations for industrializing PSCs.

关键词： polymer-fullerene solar cells electron donors and acceptors morphology interfacial layer device physics

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Molecularly horizontal stacking benefits charge separation through delocalized charge transfer states at donor-acceptor interfaces

Molecularly horizontal stacking benefits charge separation t...

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第十一届新型太阳能材料科学与技术学术研讨会

作者： Xiangkun Jia David Beljonne Donato Spoltore koen vandewal Department of Physics Zhengzhou University Dresden Integrated Center for Applied Physics and Photonic Materials (IAPP) and Institute for Applied Physics Technische Universit?t Dresden Laboratory for Chemistry of Novel Materials University of Mons Institute for Materials Research (IMO-IMOMEC) Hasselt University

The energetic landscape at the interface between electron donating and accepting molecular materials favors efficient conversion of intermolecular charge-transfer(CT) states into free charge carriers in high-performance organic solar ***,we elucidate how interfacial energetics,charge generation and radiative recombination are affected by molecular *** experimentally determine the CT dissociation properties of a series of model,small molecule donor-acceptor blends,where the used acceptors(B2PYMPM,B3PYMPM and B4PYMPM) differ only in the nitrogen position of their lateral pyridine rings.[1] We find that the formation of an ordered,face-on molecular packing in B4PYMPM is beneficial to efficient,field-independent charge separation,leading to fill factors above 70% in photovoltaic devices.[2] This is rationalized by a comprehensive computational protocol showing that,compared to the more amorphous and isotropically oriented B2PYMPM,the higher structural order in face-on B4PYMPM molecules leads to more delocalized CT ***,we find no correlation between the quantum efficiency of free charge carrier radiative recombination and the bound or unbound nature of the CT *** work highlights the importance of structural ordering at donor-acceptor interfaces for efficient free carrier generation and shows that less bound CT states do not preclude efficient radiative recombination.[3]

关键词： Charge-transfer states molecular packing exciton dissociation energy landscape non-radiative voltage losses

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