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Bratindranath Mukherjee, Swagotom Sarker, Eric Crone, Pawan Pathak, Vaidyanathan Ravi Subramanian
This work presents a hitherto unreported approach to assemble a 1D oxide-1D chalcogenide heterostructured photoactive film. As a representative system, bismuth (Bi), a low melting point catalyst, facilitated 1D CdSe nanowires are directly grown on anodized 1D-TiO2 nanotube (T_NT). A combination of the reductive successive-ionic-layer-adsorption-reaction (R-SILAR) and the solution-liquid-solid (S-L-S) approach is implemented towards the assembly of this heterostructure, reported in this 1D-1D form for the first time...
October 20, 2016: ACS Applied Materials & Interfaces
Kenji Kakiage, Hiroyuki Osada, Yohei Aoyama, Toru Yano, Keiji Oya, Shinji Iwamoto, Jun-Ichi Fujisawa, Minoru Hanaya
A dye-sensitized solar cell (DSSC) fabricated by using a novel silyl-anchor coumarin dye with alkyl-chain substitutes, a Br3(-)/Br(-) redox electrolyte solution containing water, and a Mg(2+)-doped anatase-TiO2 electrode with twofold surface modification by MgO and Al2O3 exhibited an open-circuit photovoltage over 1.4 V, demonstrating the possibility of DSSCs as practical photovoltaic devices.
October 20, 2016: Scientific Reports
Andreas Brenneis, Felix Schade, Simon Drieschner, Florian Heimbach, Helmut Karl, Jose A Garrido, Alexander W Holleitner
For future on-chip communication schemes, it is essential to integrate nanoscale materials with an ultrafast optoelectronic functionality into high-frequency circuits. The atomically thin graphene has been widely demonstrated to be suitable for photovoltaic and optoelectronic devices because of its broadband optical absorption and its high electron mobility. Moreover, the ultrafast relaxation of photogenerated charge carriers has been verified in graphene. Here, we show that dual-gated graphene junctions can be functional parts of THz-circuits...
October 20, 2016: Scientific Reports
Assaf Manor, Nimrod Kruger, Tamilarasan Sabapathy, Carmel Rotschild
The maximal Shockley-Queisser efficiency limit of 41% for single-junction photovoltaics is primarily caused by heat dissipation following energetic-photon absorption. Solar-thermophotovoltaics concepts attempt to harvest this heat loss, but the required high temperatures (T>2,000 K) hinder device realization. Conversely, we have recently demonstrated how thermally enhanced photoluminescence is an efficient optical heat-pump that operates in comparably low temperatures. Here we theoretically and experimentally demonstrate such a thermally enhanced photoluminescence based solar-energy converter...
October 20, 2016: Nature Communications
Yen-Sook Jung, Jun-Seok Yeo, Nam-Koo Kim, Sehyun Lee, Dong-Yu Kim
We report the effect of binary additives on the fabrication of polymer solar cells (PSCs) based on a bulk heterojunction (BHJ) system. The combination of 1,8-diiodooctane (DIO), a high-boiling and selective solvent, for fullerene derivatives and poly(dimethylsiloxane) (PDMS) precursor, a nonvolatile insulating additive, affords complementary functions on the effective modulation of BHJ morphology. It was found that DIO and PDMS precursor each play different roles on the control of BHJ morphology, and thus, the power conversion efficiency (PCE) can be further enhanced to 7...
October 19, 2016: ACS Applied Materials & Interfaces
Bhaskar Dudem, Yeong Hwan Ko, Jung Woo Leem, Joo Ho Lim, Jae Su Yu
We report the hierarchical nano/micro architectured (HNMA)-polydimethylsiloxane (PDMS) film-based hybrid energy cells with multi-functionality to simultaneously harvest mechanical, solar, and wind energies. These films consist of nano/micro dual-scale architectures (i.e., nanonipples on inverted micro pyramidal arrays) on the PDMS surface. The HNMA-PDMS is replicable by a facile and cost-effective soft imprint lithography (SIL) using a nanoporous anodic alumina oxide (AAO) film formed on the micro-pyramidal (MP) structured silicon substrate...
October 19, 2016: ACS Applied Materials & Interfaces
Lyubov A Frolova, Denis V Anokhin, Kirill L Gerasimov, Nadezhda N Dremova, Pavel A Troshin
Here we report a systematic study of the Pb(2+) substitution in the hybrid iodoplumbate MAPbI3 with a series of elements affecting optoelectronic, structural and morphological properties of the system. It has been shown that even partial replacement of lead with Cd(2+), Zn(2+), Fe(2+), Ni(2+), Co(2+), In(3+), Bi(3+), Sn(4+), and Ti(4+) results in a significant deterioration of the photovoltaic characteristics. On the contrary, Hg-containing hybrid MAPb1-xHgxI3 salts demonstrated a considerably improved solar cell performance at optimal mercury loading...
October 19, 2016: Journal of Physical Chemistry Letters
Mohnish Pandey, Karsten W Jacobsen, Kristian S Thygesen
Organic-inorganic halide perovskites have proven highly successful for photovoltaics, but suffer from low stability which deteriorates their performance over time. Recent experiments have demonstrated that low dimensional phases of the hybrid perovskites may exhibit improved stability, and facile routes to synthesise these compounds have also been explored. Here we report first-principles calculations of the electronic structure of the two-dimensional (2D) organometallic halide perovskites (C$_4$H$_9$NH$_3$)$_2$MX$_2$Y$_2$ where M=Pb, Ge, Sn and X,Y=Cl, Br, I...
October 19, 2016: Journal of Physical Chemistry Letters
Abdelaziz Boulesbaa, Kai Wang, Masoud Mahjouri-Samani, Mengkun Tian, Alexander A Puretzky, Ilia Ivanov, Christopher M Rouleau, Kai Xiao, Bobby G Sumpter, David B Geohegan
Photoinduced interfacial charge transfer is at the heart of many applications, including photovoltaics, photocatalysis, and photodetection. With the emergence of a new class of semiconductors such as monolayer two-dimensional transition metal dichalcogenides (2D-TMDs), charge transfer at the 2D/2D heterojunctions attracted several efforts due to the remarkable optical and electrical properties of 2D-TMDs. Unfortunately, in 2D/2D heterojunctions, for a given combination of two materials, the relative energy band alignment and the charge transfer efficiency are locked...
October 18, 2016: Journal of the American Chemical Society
Alberto Baggioli, Carlo A Cavallotti, Antonino Famulari
From proteins and peptides to semiconducting polymers, aliphatic chains on aromatic groups are recurring motifs in macromolecules from very diverse application fields. Fields in which molecular folding and packing determine the macroscopic physical properties that make such advanced materials appealing in the first place. Within each macromolecule, the intrinsic structure of each unit defines how it interacts with its neighbours, ultimately opening up or denying certain backbone conformations. This eventually also determines how macromolecules interact with each other...
October 18, 2016: Physical Chemistry Chemical Physics: PCCP
Atanu Jana, Masatoshi Ishida, Jung Su Park, Steffen Bähring, Jan O Jeppesen, Jonathan L Sessler
After the epochal discovery of the "organic metal", namely, tetrathiafulvalene (TTF)-7,7,8,8-tetracyano-p-quinodimethane (TCNQ) dyad in 1973, scientists have made efforts to derivatize TTF for constructing various supramolecular architectures to control the charge-transfer processes by adjusting the donor-acceptor strength of the dyads for numerous applications. The interesting inherent electronic donor properties of TTFs control the overall electrochemical properties of the supramolecular structures, leading to the construction of highly efficient optoelectronic materials, photovoltaic solar cells, organic field-effect transistors, and optical sensors...
October 18, 2016: Chemical Reviews
Lipin Chen, Bolin Fan, Wenbo Yan, Shaobei Li, Lihong Shi, Hongjian Chen
We demonstrate an active and controllable photo-assisted splitting of dielectric microdroplets inside a LiNbO<sub>3</sub>-based sandwich structure by utilizing the pyroelectric and photovoltaic effects of LiNbO<sub>3</sub> crystals. Basing on electrostatic simulation results, the mechanism of the photo-assisted splitting is explained; meanwhile, the microdoplet pre-polarizing and the inclined electrostatic force induced by the photovoltaic charges inside the sandwich structure are emphasized...
October 1, 2016: Optics Letters
Yasemin Saygili, Magnus Söderberg, Norman Pellet, Fabrizio Giordano, Yiming Cao, Ana B Munoz-Garcia, Shaik Mohammed Zakeeruddin, Nick Vlachopoulos, Michele Pavone, Gerrit Boschloo, Ladislav Kavan, Jacques-E Moser, Michael Grätzel, Anders Hagfeldt, Marina Freitag
Redox mediators play a major role determining the photocurrent and the photovoltage in dye-sensitized solar cells (DSCs). To maintain the photocurrent, the reduction of oxidized dye by the redox mediator should be significantly faster than the back electron transfer between TiO2 and the oxidized dye. The driving force for dye regeneration with the redox mediator should be sufficiently low to provide high photovoltages. With our introduction of new copper complexes as promising redox mediators in DSCs both criteria are satisfied to enhance power conversion efficiencies...
October 17, 2016: Journal of the American Chemical Society
Balakrishna Ananthoju, Jeotikanta Mohapatra, Manoj K Jangid, D Bahadur, N V Medhekar, M Aslam
Cations and anions are replaced with Fe, Mn, and Se in CZTS in order to control the formations of the secondary phase, the band gap, and the micro structure of Cu2ZnSnS4. We demonstrate a simplified synthesis strategy for a range of quaternary chalcogenide nanoparticles such as Cu2ZnSnS4 (CZTS), Cu2FeSnS4 (CFTS), Cu2MnSnS4 (CMTS), Cu2ZnSnSe4 (CZTSe), and Cu2ZnSn(S0.5Se0.5)4 (CZTSSe) by thermolysis of metal chloride precursors using long chain amine molecules. It is observed that the crystal structure, band gap and micro structure of the CZTS thin films are affected by the substitution of anion/cations...
October 17, 2016: Scientific Reports
Yupeng Zhang, Jingying Liu, Ziyu Wang, Yunzhou Xue, Qingdong Ou, Lakshminarayana Polavarapu, Jialu Zheng, Xiang Qi, Qiaoliang Bao
Metal-halide perovskites have been hailed as remarkable materials for photovoltaic devices and, recently, their star has also been on the rise in optoelectronics and photonics. In particular, the optical properties of a metal-halide perovskite can be widely manipulated once its bulk structure has been reduced to a low-dimensional structure, allowing multiple functionalities of light generation, emission, transmission, and detection to be realized in one material. In this paper, we highlight the recent advances in the synthesis of low-dimensional metal-halide perovskites and their unique properties as well as their novel optoelectronic and photonic applications...
October 17, 2016: Chemical Communications: Chem Comm
Vasiliki Savvilotidou, Alexandra Antoniou, Evangelos Gidarakos
End-of-Life (EoL) photovoltaic (P/V) modules, which are recently included in the 2012/19/EU recast, require sound and sustainable treatment. Under this perspective, this paper deals with 2nd generation P/V waste modules, known as thin-film, via applying chemical treatment techniques. Two different types of modules are examined: (i) tandem a-Si:H/μc-Si:H panel and, (ii) Copper-Indium-Selenide (CIS) panel. Panels' pretreatment includes collection, manual dismantling and shredding; pulverization and digestion are further conducted to identify their chemical composition...
October 11, 2016: Waste Management
Maciej Zalas, Agata Wawrzyńczak, Paulina Półrolniczak, Jan Sobuś, Grzegorz Schroeder, Stefan Jurga, Elena Selli
A series of 14 mesoporous titania materials has been synthesized using the simple alcothermal template-free method and various alcohols, such as methanol, propanols and butanols, as solvents. All materials were characterized by both wide and small angle XRD, which exhibited the anatase phase with short-range ordered mesoporous structure that is still forming during post synthetic temperature treatment in most of the investigated materials. Nitrogen adsorption-desorption isotherms confirmed the mesoporous structure with surface area ranging from 241 to 383 m2g- 1 and pore volumes from 0...
2016: PloS One
Silvia Colella, Marco Mazzeo, Aurora Rizzo, Giuseppe Gigli, Andrea Listorti
Incubating in the rise of the perovskite photovoltaic era, an intelligent material design allows now for a fine tune of the properties, targeting also light-emitting applications. Herein benefits derive from the use of low dimensional and nanostructured perovskites, marginally exploited in photovoltaic devices, allowing for exciton engineering and for intrinsic resonating structures. By evaluating halide perovskites, envisioning light-emitting applications, particular attention is dedicated to the role that this material can effectively play in the field...
October 14, 2016: Journal of Physical Chemistry Letters
Laura Calió, Samrana Kazim, Michael Grätzel, Shahzada Ahmad
The pressure to move towards renewable energy has inspired researchers to look for ideas in photovoltaics that may lead to a major breakthrough. Recently the use of perovskites as a light harvester has lead to stunning progress. The power conversion efficiency of perovskite solar cells is now approaching parity (>22 %) with that of the established technology which took decades to reach this level of performance. The use of a hole transport material (HTM) remains indispensable in perovskite solar cells...
October 14, 2016: Angewandte Chemie
Chang Yu, Zhiqiang Liu, Xiangtong Meng, Bing Lu, Dan Cui, Jieshan Qiu
Alternative high-performance electrocatalysts for triiodide (I3(-)) reduction of low-cost dye-sensitized solar cells (DSSCs) are urgently sought after. To address the concerned issues, we report a facile strategy for engineering the nitrogen and phosphorus dual-doped graphene (NPG) via an efficient ball-milling process, followed by a simple thermal annealing approach utilizing melamine (C3H6N6) and triphenylphosphine ((C6H5)3P) as the N and P source, respectively. When employed as the counter electrode (CE) in DSSCs, such a metal-free material exhibits excellent electrocatalytic activity towards the I3(-)/I(-) redox reaction...
October 14, 2016: Nanoscale
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