Journal ArticleDOI
Effects of Solvent Additives on Morphology, Charge Generation, Transport, and Recombination in Solution-Processed Small-Molecule Solar Cells
Aung Ko Ko Kyaw,Dong Hwan Wang,Dong Hwan Wang,Chan Luo,Chan Luo,Yong Cao,Thuc-Quyen Nguyen,Guillermo C. Bazan,Alan J. Heeger +8 more
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In this article, the effects of solvent additive (1,8-diiodooctane (DIO)) on the morphology, charge generation, transport, and recombination in solution-processed small-molecule solar cells are studied and these parameters are correlated with device performance.Abstract:
The effects of solvent additive (1,8-diiodooctane (DIO)) on the morphology, charge generation, transport, and recombination in solution-processed small-molecule solar cells are studied and these parameters are correlated with device performance. In the optimum nanoscale morphology, which is processed with 0.4% DIO, the phase separation is large enough to create a percolating pathway for carrier transport, yet still small enough to form large interfacial area for efficient charge separation. Complete phase separation in this film reduces the interfacial defects, which occurs without DIO, and hence suppresses the monomolecular recombination. Moreover, balanced charge transport and weak bimolecular recombination lead to a high fill factor (72%). On the other hand, an excess amount of DIO (0.8%) in the solvent results in the over-aggregation of the donor phase, which disturbs the percolating pathway of the acceptor phase and reduces the electron mobility. The over-aggregation of the donor phase also shrinks the interfacial area for charge separation and consequently reduces the photocurrent generation.read more
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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
Small is Powerful: Recent Progress in Solution‐Processed Small Molecule Solar Cells
TL;DR: In this article, a review of the highest performing blend systems is presented in order to identify key trends and provide perspective on current progress in the field, highlighting what is known to date on processes limiting device efficiency, an outlook on the most important challenges remaining to the field is provided.
Journal ArticleDOI
Subtle Molecular Tailoring Induces Significant Morphology Optimization Enabling over 16% Efficiency Organic Solar Cells with Efficient Charge Generation.
Zichun Zhou,Wenrui Liu,Guanqing Zhou,Ming Zhang,Deping Qian,Jianyun Zhang,Shanshan Chen,Shengjie Xu,Changduk Yang,Feng Gao,Haiming Zhu,Feng Liu,Xiaozhang Zhu +12 more
TL;DR: A good structure-morphology-property relationship is established and the reduced phase separation morphology of AQx-2-based bulk heterojunction blend boosts hole transfer and suppresses geminate recombination, which may lead to next-generation high-performance OSCs.
Journal ArticleDOI
Highly efficient halogen-free solvent processed small-molecule organic solar cells enabled by material design and device engineering
TL;DR: In this paper, low bandgap small molecules, BDTTNTTR and BDTSTNTTR, with benzo[1,2-b:4,5-b′]dithiophene (BDT) as the central donor unit and naphtho[1.2-c:5,6-c′]bis[ 1,2,5]thiadiazole (NT), which were also π-bridged with terthiophenes on both sides, and end-capped with 3-ethylrhodanine
Journal ArticleDOI
Importance of Domain Purity and Molecular Packing in Efficient Solution‐Processed Small‐Molecule Solar Cells
Subhrangsu Mukherjee,Christopher M. Proctor,John R. Tumbleston,Guillermo C. Bazan,Thuc-Quyen Nguyen,Harald Ade +5 more
TL;DR: Connections are delineated between solar-cell performance, charge-carrier mobilities, and morphology in a highperformance molecular solar cell and the observations show that maximizing the relative phase purity and structural order while simultaneously limiting the domain size may be essential for achieving optimal solar- cell performances in solution-processed small-molecule solar cells.
References
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Polymer photovoltaic cells : enhanced efficiencies via a network of internal donor-acceptor heterojunctions
TL;DR: In this paper, the carrier collection efficiency and energy conversion efficiency of polymer photovoltaic cells were improved by blending of the semiconducting polymer with C60 or its functionalized derivatives.
Journal ArticleDOI
Statistics of the Recombinations of Holes and Electrons
William Shockley,W. T. Read +1 more
TL;DR: In this article, the statistics of the recombination of holes and electrons in semiconductors were analyzed on the basis of a model in which the recombinations occurred through the mechanism of trapping.
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High-efficiency solution processable polymer photovoltaic cells by self-organization of polymer blends
TL;DR: In this article, the authors report highly efficient polymer solar cells based on a bulk heterojunction of polymer poly(3-hexylthiophene) and methanofullerene.
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The path to ubiquitous and low-cost organic electronic appliances on plastic
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Journal ArticleDOI
Thermally stable, efficient polymer solar cells with nanoscale control of the interpenetrating network morphology
TL;DR: By applying specific fabrication conditions summarized in the Experimental section and post-production annealing at 150°C, polymer solar cells with power-conversion efficiency approaching 5% were demonstrated.