Molecular Understanding of Organic Solar Cells: The Challenges

Molecular Understanding of Organic Solar Cells: The Challenges Jean-Luc Brédas, Joseph E. Norton, Jérôme Cornil, Veaceslav Coropceanu
	“Plastic” Solar Cells: Self-Assembly of Bulk Heterojunction Nanomaterials by Spontaneous Phase Separation Jeffrey Peet, Alan J. Heeger and Guillermo C. Bazan
	Development of Novel Conjugated Donor Polymers for High-Efficiency Bulk-Heterojunction Photovoltaic Devices Junwu Chen, Yong Cao
	Molecular Bulk Heterojunctions: An Emerging Approach to Organic Solar Cells Jean Roncali
	Alternating Polyfluorenes Collect Solar Light in Polymer Photovoltaics Olle Inganäs, Fengling Zhang, Mats R. Andersson
	Strategies for Increasing the Efficiency of Heterojunction Organic Solar Cells: Material Selection and Device Architecture Paul Heremans, David Cheyns, Barry P. Rand
	Oxide Contacts in Organic Photovoltaics: Characterization and Control of Near-Surface Composition in Indium-Tin Oxide (ITO) Electrodes Neal R. Armstrong, P. Alex Veneman, Erin Ratcliff, Diogenes Placencia, Michael Brumbach
	Critical Interfaces in Organic Solar Cells and Their Influence on the Open-Circuit Voltage William J. Potscavage Jr., Asha Sharma, Bernard Kippelen
	Modeling Charge Transport in Organic Photovoltaic Materials Jenny Nelson, Joe J. Kwiatkowski, James Kirkpatrick, Jarvist M. Frost
	Charge-Transfer Excitons at Organic Semiconductor Surfaces and Interfaces X.-Y. Zhu, Q. Yang, M. Muntwiler
	Recent Advances in Sensitized Mesoscopic Solar Cells Michael Grätzel
	Kinetic and Energetic Paradigms for Dye-Sensitized Solar Cells: Moving from the Ideal to the Real Brian C. O’Regan, James R. Durrant
	Large π-Aromatic Molecules as Potential Sensitizers for Highly Efficient Dye-Sensitized Solar Cells Hiroshi Imahori, Tomokazu Umeyama, Seigo Ito
	Characteristics of the Iodide/Triiodide Redox Mediator in Dye-Sensitized Solar Cells Gerrit Boschloo, Anders Hagfeldt
	Iodine/Iodide-Free Dye-Sensitized Solar Cells Shozo Yanagida, Youhai Yu, Kazuhiro Manseki
	“Sticky Electrons” Transport and Interfacial Transfer of Electrons in the Dye-Sensitized Solar Cell Laurence Peter
	Recombination in Quantum Dot Sensitized Solar Cells Iván Mora-Seró, Sixto Giménez, Francisco Fabregat-Santiago, Roberto Gómez, Qing Shen, Taro Toyoda, Juan Bisquert

High-Efficiency Polymer Tandem Solar Cells with Three-Terminal Structure

Yang Yang

Optimizing Polymer Tandem Solar Cells

Optimized tandem solar cells based on wide-and small-bandgap polymer semiconductor cells reach an efficiency of 4.9%. In this tandem cell the short-circuit current exceeds that of the current-limiting subcell. The recombination layer that connects the two subcells does not impose important losses.

René A. J. Janssen

For sign

Novel Poly(propylene terephthalate-co-succinate) Random Copolymers: Synthesis, Solid Structure, and Enzymatic Degradation Study

A series of aromatic/aliphatic poly(propylene terephthalate-co-succinate) (PPTSu) random copolyesters of high molecular weight were synthesized. Enzymatic hydrolysis study showed that copolymers with terephthalate content up to 60 mol % could be hydrolyzed. Cocrystallization, thermal behavior, and spherulitic morphology were investigated. Melting points of the copolymers were depressed and followed a rather sigmoid curve, without exhibiting a eutectic behavior. Wide-angle X-ray diffraction patterns indicated that the copolymers crystallized in PPT crystal, but the interplanar spacings varied linearly. These are probable indications of isomorphic cocrystallization. A single Tg was found for the copolyesters. Interestingly, after crystallization of the PPTSu copolymers with up to 60 mol % terephthalate content, the remaining amorphous phase showed increased mobility, as proved by a reduction of the Tg compared to the amorphous samples. This indicates some kind of segregation of chain segments occurring during crystallization, with preferable incorporation of propylene tetrephthalate (PT) units into the crystals and enrichment of the amorphous phase in hydrolyzable propylene succinate (PSu) sequences. As for neat PPT, banded spherulites were observed for the copolyesters. Most mechanical properties decreased with increasing PSu content compared to neat PPT.

Macromolecules, ASAP Article 10.1021/ma702508m