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organic photovoltaic

Tzu-Chiao Wei, Hsin-Ping Wang, Ting-You Li, Chun-Ho Lin, Ying-Hui Hsieh, Ying-Hao Chu, Jr-Hau He
Organic-inorganic hybrid perovskite materials exhibit a variety of physical properties. Pronounced coupling between phonon, organic cations, and the inorganic framework suggest that these materials exhibit strong light-matter interactions. The photoinduced strain of CH3 NH3 PbBr3 is investigated using high-resolution and contactless in situ Raman spectroscopy. Under illumination, the material exhibits large blue shifts in its Raman spectra that indicate significant structural deformations (i.e., photostriction)...
July 17, 2017: Advanced Materials
Jiayu Wang, Wei Wang, Xiaohui Wang, Yang Wu, Qianqian Zhang, Cenqi Yan, Wei Ma, Wei You, Xiaowei Zhan
A side-chain conjugation strategy in the design of nonfullerene electron acceptors is proposed, with the design and synthesis of a side-chain-conjugated acceptor (ITIC2) based on a 4,8-bis(5-(2-ethylhexyl)thiophen-2-yl)benzo[1,2-b:4,5-b']di(cyclopenta-dithiophene) electron-donating core and 1,1-dicyanomethylene-3-indanone electron-withdrawing end groups. ITIC2 with the conjugated side chains exhibits an absorption peak at 714 nm, which redshifts 12 nm relative to ITIC1. The absorption extinction coefficient of ITIC2 is 2...
July 17, 2017: Advanced Materials
Florian Steiner, John M Lupton, Jan Vogelsang
Triplet excitons have been the focus of considerable attention with regards to the functioning of polymer solar cells because these species are long-lived and quench subsequently generated singlet excitons in their vicinity. The role of triplets in poly(3-hexylthiophene) (P3HT) has been investigated extensively with contrary conclusions regarding their importance. We probe the various roles triplets can play in P3HT by analyzing the photoluminescence (PL) from isolated single-chain aggregates and multichain mesoscopic aggregates...
July 14, 2017: Journal of the American Chemical Society
Ravi K Misra, Bat-El Cohen, Lior Iagher, Lioz Etgar
Three-dimensional (3D) perovskite has attracted a lot of attention due to its success in photovoltaic (PV) solar cells. However, one the major crucial issues lies in its stability, which has limited its commercialization. An important property of organic-inorganic perovskite is the possibility of forming a layered material using long organic cations that do not fit into the octahedral cage. The long organic cation acts as a "barrier" that "caps" the 3D perovskite forming the layered material. Controlling the number of perovskite layers could provide a confined structure with different chemical and physical properties than 3D perovskite has...
July 13, 2017: ChemSusChem
Antonietta De Sio, Christoph Lienau
Light-induced charge transfer from the photoexcited donor to the acceptor is the fundamental step towards current generation in organic solar cells. Experimental evidence for efficient charge separation on ultrafast time scales has been available for quite some time. Yet even today, the elementary mechanisms underlying this process in organic semiconductors and in particular the role of the coherent wave-like motion of electrons and nuclei for the charge separation are still a matter of considerable debate...
July 12, 2017: Physical Chemistry Chemical Physics: PCCP
Chaw Keong Yong, Andrew J Musser, Sam L Bayliss, Steven Lukman, Hiroyuki Tamura, Olga Bubnova, Rawad K Hallani, Aurélie Meneau, Roland Resel, Munetaka Maruyama, Shu Hotta, Laura M Herz, David Beljonne, John E Anthony, Jenny Clark, Henning Sirringhaus
Entanglement of states is one of the most surprising and counter-intuitive consequences of quantum mechanics, with potent applications in cryptography and computing. In organic materials, one particularly significant manifestation is the spin-entangled triplet-pair state, which mediates the spin-conserving fission of one spin-0 singlet exciton into two spin-1 triplet excitons. Despite long theoretical and experimental exploration, the nature of the triplet-pair state and inter-triplet interactions have proved elusive...
July 12, 2017: Nature Communications
Maher Ezzedini, Tarek Hidouri, Mohamed Helmi Hadj Alouane, Amor Sayari, Elsayed Shalaan, Nicolas Chauvin, Larbi Sfaxi, Faouzi Saidi, Ahmed Al-Ghamdi, Catherine Bru-Chevallier, Hassen Maaref
This paper reports on experimental and theoretical investigations of atypical temperature-dependent photoluminescence properties of multi-stacked InAs quantum dots in close proximity to InGaAs strain-relief underlying quantum well. The InAs/InGaAs/GaAs QD heterostructure was grown by solid-source molecular beam epitaxy (SS-MBE) and investigated via photoluminescence (PL), spectroscopic ellipsometry (SE), and picosecond time-resolved photoluminescence. Distinctive double-emission peaks are observed in the PL spectra of the sample...
December 2017: Nanoscale Research Letters
Gordon J Hedley, Florian Steiner, Jan Vogelsang, John M Lupton
Low-gap conjugated polymers have enabled an impressive increase in the efficiencies of organic solar cells, primarily due to their red absorption which allows harvesting of that part of the solar spectrum. Here, we report that the true optical gap of one prototypical material, PTB7, is in fact at significantly higher energy than has previously been reported, indicating that the red absorption utilized in these materials in solar cells is entirely due to chain aggregation. Using single-molecule spectroscopy we find that PL from isolated nanoscale aggregates consists of multiple independently emitting chromophores...
July 11, 2017: Journal of Physical Chemistry Letters
N Schuergers, C Werlang, C M Ajo-Franklin, A A Boghossian
The ability to electronically interface living cells with electron accepting scaffolds is crucial for the development of next-generation biophotovoltaic technologies. Although recent studies have focused on engineering synthetic interfaces that can maximize electronic communication between the cell and scaffold, the efficiency of such devices is limited by the low conductivity of the cell membrane. This review provides a materials science perspective on applying a complementary, synthetic biology approach to engineering membrane-electrode interfaces...
May 1, 2017: Energy & Environmental Science
Wei-Chieh Chen, Santhanamoorthi Nachimuthu, Jyh-Chiang Jiang
Determining an ideal adsorption configuration for a dye on the semiconductor surface is an important task in improving the overall efficiency of dye-sensitized solar cells. Here, we present a detailed investigation of different adsorption configurations of designed model dyes on TiO2 anatase (101) surface using first principles methods. Particularly, we aimed to investigate the influence of cyano group in the anchoring part of dye on its adsorption stability and the overall photovoltaic properties such as open circuit voltage, electron injection ability to the surface...
July 10, 2017: Scientific Reports
Tao Dong, Lei Lv, Linlin Feng, Yu Xia, Wei Deng, Pan Ye, Bei Yang, Shang Ding, Antonio Facchetti, Huanli Dong, Hui Huang
Noncovalent conformational locks are broadly employed to construct highly planar π-conjugated semiconductors exhibiting substantial charge transport characteristics. However, current chalcogen-based conformational lock strategies for organic semiconductors are limited to S···X (X = O, N, halide) weak interactions. An easily accessible (minimal synthetic steps) and structurally planar selenophene-based building block, 1,2-diethoxy-1,2-bisselenylvinylene (DESVS), with novel Se···O noncovalent conformational locks is designed and synthesized...
July 10, 2017: Advanced Materials
Jacqueline Manina Cole, Martin Blood-Forsythe, Tze-Chia Lin, Philip Pattison, Yun Gong, Alvaro Vázquez-Mayagoitia, Paul G Waddell, Lei Zhang, Nagatoshi Koumura, Shogo Mori
Donor--Acceptor dyes containing thiophenyl -conjugated units and cyanoacrylate acceptor groups are among the best-performing organic chromophores used in dye-sensitized solar cell (DSC) applications. Yet, the molecular origins of their high photovoltaic output have remained unclear until now. This synchrotron-based X-ray diffraction study eluci-dates these origins for the high-performance thiophenylcy-anoacrylate-based dye, MK-2 (7.7% DSC device efficiency), and its molecular building block, MK-44. The crystal struc-tures of MK-2 and MK-44 are both determined, while a high-resolution charge-density mapping of the smaller mole-cule was also possible, enabling the nature of its bonding to be detailed...
July 10, 2017: ACS Applied Materials & Interfaces
Ryan P Bisbey, William R Dichtel
The simultaneous polymerization and crystallization of monomers featuring directional bonding designs provides covalent organic frameworks (COFs), which are periodic polymer networks with robust covalent bonds arranged in two- or three-dimensional topologies. The range of properties characterized in COFs has rapidly expanded to include those of interest for heterogeneous catalysis, energy storage and photovoltaic devices, and proton-conducting membranes. Yet many of these applications will require materials quality, morphological control, and synthetic efficiency exceeding the capabilities of contemporary synthetic methods...
June 28, 2017: ACS Central Science
Felix Kraffert, Daniel Bahro, Christoph Meier, Maximilian Denne, Alexander Colsmann, Jan Behrends
Tandem solar cells constitute the most successful organic photovoltaic devices with power conversion efficiencies comparable to thin-film silicon solar cells. Especially their high open-circuit voltage - only achievable by a well-adjusted layer stacking - leads to their high efficiencies. Nevertheless, the microscopic processes causing the lossless recombination of charge carriers within the recombination zone are not well understood yet. We show that advanced pulsed electrically detected magnetic resonance techniques such as electrically detected (ED)-Rabi nutation measurements and electrically detected hyperfine sublevel correlation (ED-HYSCORE) spectroscopy help to understand the role of triplet excitons in these microscopic processes...
June 27, 2017: Journal of Magnetic Resonance
Qidong Tai, Feng Yan
Semitransparent solar cells can provide not only efficient power-generation but also appealing images and show promising applications in building integrated photovoltaics, wearable electronics, photovoltaic vehicles and so forth in the future. Such devices have been successfully realized by incorporating transparent electrodes in new generation low-cost solar cells, including organic solar cells (OSCs), dye-sensitized solar cells (DSCs) and organometal halide perovskite solar cells (PSCs). In this review, the advances in the preparation of semitransparent OSCs, DSCs, and PSCs are summarized, focusing on the top transparent electrode materials and device designs, which are all crucial to the performance of these devices...
July 6, 2017: Advanced Materials
Luis K Ono, Emilio J Juárez-Pérez, Yabing Qi
Organic-inorganic halide perovskite materials (e.g. MAPbI3, FAPbI3, etc; where MA = CH3NH3+; FA = CH(NH2)2+) have been studied intensively for photovoltaic applications. Major concerns for the commercialization of perovskite photovoltaic technology to take off include lead toxicity, long-term stability, hysteresis, and optimal bandgap. Therefore, there is still needs for further exploration of alternative candidates. Elemental composition engineering of MAPbI3 and FAPbI3 has been proposed to address the above concerns...
July 6, 2017: ACS Applied Materials & Interfaces
Jinxuan Liu, Christof Wöll
Surface-supported metal-organic framework thin films are receiving increasing attention as a novel form of nanotechnology. New deposition techniques that enable the control of the film thickness, homogeneity, morphology, and dimensions with a huge number of metal-organic framework compounds offer tremendous opportunities in a number of different application fields. In response to increasing demands for environmental sustainability and cleaner energy, much effort in recent years has been devoted to the development of MOF thin films for applications in photovoltaics, CO2 reduction, energy storage, water splitting, and electronic devices, as well as for the fabrication of membranes...
July 6, 2017: Chemical Society Reviews
Mohammad Aref Khalily, Gokhan Bakan, Betul Kucukoz, Ahmet Emin Topal, Ahmet Karatay, H Gul Yaglioglu, Aykutlu Dana, Mustafa O Guler
Fabrication of supramolecular electroactive materials at the nanoscale with well-defined size, shape, composition, and organization in aqueous medium is a current challenge. Herein we report construction of supramolecular charge-transfer complex one-dimensional (1D) nanowires consisting of highly ordered mixed-stack π-electron donor-acceptor (D-A) domains. We synthesized n-type and p-type β-sheet forming short peptide-chromophore conjugates, which assemble separately into well-ordered nanofibers in aqueous media...
July 11, 2017: ACS Nano
Yujie Han, Yuqiang Liu, Jianyu Yuan, Huilong Dong, Youyong Li, Wanli Ma, Shuit-Tong Lee, Baoquan Sun
Silicon (Si)-organic heterojunction solar cells suffer from a noticeable weakness of inefficient rear contact. To improve this rear contact quality, here, two solution-processed organic n-type donor-acceptor naphthalene diimide (NDI)-based conjugated polymers of N2200 and fluorinated analog F-N2200 are explored to reduce the contact resistance as well as to passivate Si surface. Both N2200 and F-N2200 exhibit high electron mobility due to its planar structure and strong intermolecular stacking, thus allow them to act as excellent transporting layers...
July 5, 2017: ACS Nano
Tianran Chen, Wei-Liang Chen, Benjamin J Foley, Jooseop Lee, Jacob P C Ruff, J Y Peter Ko, Craig M Brown, Leland W Harriger, Depei Zhang, Changwon Park, Mina Yoon, Yu-Ming Chang, Joshua J Choi, Seung-Hun Lee
Long carrier lifetime is what makes hybrid organic-inorganic perovskites high-performance photovoltaic materials. Several microscopic mechanisms behind the unusually long carrier lifetime have been proposed, such as formation of large polarons, Rashba effect, ferroelectric domains, and photon recycling. Here, we show that the screening of band-edge charge carriers by rotation of organic cation molecules can be a major contribution to the prolonged carrier lifetime. Our results reveal that the band-edge carrier lifetime increases when the system enters from a phase with lower rotational entropy to another phase with higher entropy...
July 3, 2017: Proceedings of the National Academy of Sciences of the United States of America
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