Journal Article10.1021/AR900041B
Molecular bulk heterojunctions: an emerging approach to organic solar cells.
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TL;DR: Results show that soluble molecular donors can lead to BHJ cells that combine high conversion efficiency with the distinct advantages of working with single molecules, including structural definition, synthesis, purification, and reproducibility.
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Abstract: The predicted exhaustion of fossil energy resources and the pressure of environmental constraints are stimulating an intensification of research on renewable energy sources, in particular, on the photovoltaic conversion of solar energy. In this context, organic solar cells are attracting increasing interest that is motivated by the possibility of fabricating large-area, lightweight, and flexible devices using simple techniques with low environmental impact. Organic solar cells are based on a heterojunction resulting from the contact of a donor (D) and an acceptor (A) material. Absorption of solar photons creates excitons, Coulombically bound electron−hole pairs, which diffuse to the D/A interface, where they are dissociated into free holes and electrons by the electric field. D/A heterojunctions can be created with two types of architectures, namely, bilayer heterojunction and bulk heterojunction (BHJ) solar cells. BHJ cells combine the advantages of easier fabrication and higher conversion efficiency due...
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Citations
Triphenylamine-Merocyanine-Based D1-A1-π-A2/A3-D2 Chromophore System: Synthesis, Optoelectronic, and Theoretical Studies.
TL;DR: The incorporation of TCNE and TCNQ as strong electron withdrawing units led to strong intramolecular charge-transfer interactions, resulting in lower LUMO energy levels, and comparative UV–Vis absorption, fluorescence emission, and electrochemical and computational studies were performed to understand the effects.
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Effect of Benzothiadiazole-Based π-Spacers on Fine-Tuning of Optoelectronic Properties of Oligothiophene-Core Donor Materials for Efficient Organic Solar Cells: A DFT Study.
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TL;DR: In this paper, the relationship between photophysical processes and solar cell character istics in solution-processable bulk heterojunctions (BHJs), in particular: (1) polymer donor:ful- lerene acceptor: small-molecule (SM) nonfullerene acceptors, (2) polymer donors:SM donor:SM non-lerene acceptedor, and (3) SM donor: SM nonful lerene or fullerene acceptanceor.
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