Journal ArticleDOI
Charge Transfer State Versus Hot Exciton Dissociation in Polymer−Fullerene Blended Solar Cells
Jiye Lee,Koen Vandewal,Shane R. Yost,Matthias E. Bahlke,Ludwig Goris,Marc A. Baldo,Jean Manca,Troy Van Voorhis +7 more
TLDR
The internal quantum yield of carrier photogeneration are similar for both excitons and direct excitation of charge transfer states, which is consistent with negligible impact from hot exciton dissociation.Abstract:
We examine the significance of hot exciton dissociation in two archetypical polymer−fullerene blend solar cells. Rather than evolving through a bound charge transfer state, hot processes are proposed to convert excitons directly into free charges. But we find that the internal quantum yields of carrier photogeneration are similar for both excitons and direct excitation of charge transfer states. The internal quantum yield, together with the temperature dependence of the current−voltage characteristics, is consistent with negligible impact from hot exciton dissociation.read more
Citations
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25th Anniversary Article: A Decade of Organic/Polymeric Photovoltaic Research
TL;DR: This review article takes a retrospective look at the research and development of OPV, and focuses on recent advances of solution-processed materials and devices during the last decade, particular the polymer version of the materials and Devices.
Journal ArticleDOI
The Role of Driving Energy and Delocalized States for Charge Separation in Organic Semiconductors
Artem A. Bakulin,Akshay Rao,V.G. Pavelyev,Paul H. M. van Loosdrecht,Maxim S. Pshenichnikov,Dorota Niedzialek,Jérôme Cornil,David Beljonne,Richard H. Friend +8 more
TL;DR: In this paper, the electron-hole pair created via photon absorption in organic photoconversion systems must overcome the Coulomb attraction to achieve long-range charge separation, and this process is facilitated through the formation of excited, delocalized band states.
Journal ArticleDOI
Materials interface engineering for solution-processed photovoltaics
TL;DR: The nanometre and micrometre scale interfaces between the crystalline domains that make up solution-processed solar cells are crucial for efficient charge transport and controlling the collection and minimizing the trapping of charge carriers at these boundaries is crucial to efficiency.
Journal ArticleDOI
Organic Optoelectronic Materials: Mechanisms and Applications
TL;DR: The article reviews the current understanding of the physical mechanisms that determine the (opto)electronic properties of high-performance organic materials and highlights the capabilities of various experimental techniques for characterization, summarizes top-of-the-line device performance, and outlines recent trends in the further development of the field.
Journal ArticleDOI
Efficient charge generation by relaxed charge-transfer states at organic interfaces
Koen Vandewal,Steve Albrecht,Eric T. Hoke,Kenneth R. Graham,Johannes Widmer,Jessica D. Douglas,Marcel Schubert,William R. Mateker,Jason T. Bloking,George F. Burkhard,Alan Sellinger,Jean M. J. Fréchet,Aram Amassian,Moritz Riede,Michael D. McGehee,Dieter Neher,Alberto Salleo +16 more
TL;DR: For a wide range of photovoltaic devices based on polymer:fullerene, small-molecule:C60 and polymer:polymer blends, the study reveals that the internal quantum efficiency is essentially independent of whether or not D, A or CT states with an energy higher than that of CT1 are excited.
References
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Journal ArticleDOI
Bulk heterojunction solar cells with internal quantum efficiency approaching 100
Sung Heum Park,Sung Heum Park,Anshuman Roy,Serge Beaupré,Shinuk Cho,Shinuk Cho,Nelson E. Coates,Ji Sun Moon,Ji Sun Moon,Daniel Moses,Mario Leclerc,Kwanghee Lee,Kwanghee Lee,Alan J. Heeger,Alan J. Heeger +14 more
TL;DR: In this paper, a polymer solar cell based on a bulk hetereojunction design with an internal quantum efficiency of over 90% across the visible spectrum (425 nm to 575 nm) is reported.
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Insights into Current Limitations of Density Functional Theory
TL;DR: This work characterized and understood the delocalization error and static correlation error of commonly used approximations of density functional theory through the perspective of fractional charges and fractional spins introduced recently.
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Device Physics of Polymer:Fullerene Bulk Heterojunction Solar Cells
TL;DR: In this paper, the authors review the processes and limitations that govern device operation of polymer-fullerene BHJ solar cells, with respect to the charge-carrier transport and photogeneration mechanism.
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On the origin of the open-circuit voltage of polymer–fullerene solar cells
TL;DR: It is demonstrated that charge-transfer absorption and emission are shown to be related to each other and Voc is determined by the formation of these states in accordance with the assumptions of the detailed balance and quasi-equilibrium theory.
Journal ArticleDOI
Relating the open-circuit voltage to interface molecular properties of donor:acceptor bulk heterojunction solar cells
TL;DR: In this article, the open-circuit voltage of polymer:fullerene bulk heterojunction solar cells is determined by the interfacial charge transfer (CT) states between polymer and fullerene.