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https://www.readbyqxmd.com/read/28323409/high-quality-lavo3-films-as-solar-energy-conversion-material
#1
Hai-Tian Zhang, Matthew J Brahlek, Xiaoyu Ji, Shiming Lei, Jason Lapano, John W Freeland, Venkatraman Gopalan, Roman Engel-Herbert
Mott insulating oxides and their heterostructures have recently been identified as potential photovoltaic materials with favorable absorption properties and an intrinsic built-in electric field that can efficiently separate excited electron-hole pairs. At the same time, they are predicted to overcome the Shockley-Queisser limit due to strong electron-electron interaction present. Despite these premises a high concentration of defects commonly observed in Mott insulating films acting as recombination centers can derogate the photovoltaic conversion efficiency...
March 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28317965/direct-observation-of-the-rise-of-delayed-fluorescence-in-dithienylbenzothiadiazole-and-its-role-in-the-excited-state-dynamics-of-a-donor-acceptor-donor-molecule
#2
Maneesha Esther Mohanty, Chakali Madhu, Vanammoole Lakshmi Reddy, Mahalingavelar Paramasivam, Prakriti Ranjan Bangal, Vaidya Jayathirtha Rao
Dithienylbenzothiadiazole (DTBT) is used as a building block in several molecules having application in organic light emitting devices (OLED) and organic photovoltaic (OPV) devices. Delayed fluorescence (DF) is the preferred design principle employed currently in OLED research. DTBT has excellent delayed fluorescence properties which makes this moiety a potentially viable OLED material. Here, the dynamics of intersystem crossing (ISC) and reverse intersystem crossing (RISC) have been explored using fluorescence, phosphorescence, fluorescence lifetime and transient absorption measurements...
March 20, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28317382/effects-on-photovoltaic-performance-of-dialkyloxy-benzothiadiazole-copolymers-by-varying-the-thienoacene-donor
#3
Gururaj P Kini, Sora Oh, Zaheer Abbas, Shafket Rasool, Muhammad Jahandar, Chang Eun Song, Sang Kyu Lee, Won Suk Shin, Won-Wook So, Jong-Cheol Lee
A series of four donor-acceptor alternating copolymers based on dialkyloxy-benzothiadiazole (ROBT) as an acceptor and thienoacenes as a donor units were synthesized and tested for polymer solar cells (PSCs). These new polymers had different donor units with varied electron-donating ability (thieno[3,2-b]thiophene (TT), dithieno[3,2-b:2',3'-d]thiophene (DTT), benzo[1,2-b:4,5-b']dithiophene (BDT) and naphtha[1,2-b:5,6-b']dithiophene (NDT)) in the polymer backbone. To understand the effect of these thienoacenes on the optoelectronic and photovoltaic properties of the copolymers, we systematically analyzed and compared energy levels, crystallinity, morphology, charge recombination and charge carrier mobility in the resulting polymers...
March 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28317371/high-performance-near-infrared-luminescent-solar-concentrators
#4
Raquel Rondão, Ana Frias, Sandra Correia, Lianshe Fu, Verónica de Zea Bermudez, Paulo André, Rute A S Ferreira, Luis D Carlos
Luminescent solar concentrators (LSCs) appear as candidates to enhance the performance of photovoltaic (PV) cells and contribute to reduce the size of PV systems, decreasing, therefore, the amount of material needed, and thus the cost associated with energy conversion. One way to maximize the devices performance is to explore near infrared (NIR)-emitting centers, resonant with the maximum optical response of the most common Si-based PV cells. Nevertheless, very few examples in the literature demonstrate the feasibility of fabricating LSCs emitting in the NIR region...
March 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28314360/optimization-of-the-surface-structure-on-black-silicon-for-surface-passivation
#5
Xiaojie Jia, Chunlan Zhou, Wenjing Wang
Black silicon shows excellent anti-reflection and thus is extremely useful for photovoltaic applications. However, its high surface recombination velocity limits the efficiency of solar cells. In this paper, the effective minority carrier lifetime of black silicon is improved by optimizing metal-catalyzed chemical etching (MCCE) method, using an Al2O3 thin film deposited by atomic layer deposition (ALD) as a passivation layer. Using the spray method to eliminate the impact on the rear side, single-side black silicon was obtained on n-type solar grade silicon wafers...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28306282/mesoscopic-free-path-of-nonthermalized-photogenerated-carriers-in-a-ferroelectric-insulator
#6
Zongquan Gu, Dominic Imbrenda, Andrew L Bennett-Jackson, Matthias Falmbigl, Adrian Podpirka, Thomas C Parker, Daniel Shreiber, Mathew P Ivill, Vladimir M Fridkin, Jonathan E Spanier
We show how finite-size scaling of a bulk photovoltaic effect-generated electric field in epitaxial ferroelectric insulating BaTiO_{3}(001) films and a photo-Hall response involving the bulk photovoltaic current reveal a large room-temperature mean free path of photogenerated nonthermalized electrons. Experimental determination of mesoscopic ballistic optically generated carrier transport opens a new paradigm for hot electron-based solar energy conversion, and for facile control of ballistic transport distinct from existing low-dimensional semiconductor interfaces, surfaces, layers, or other structures...
March 3, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28303938/modulated-ch3nh3pbi3-xbrx-film-for-efficient-perovskite-solar-cells-exceeding-18
#7
Yongguang Tu, Jihuai Wu, Zhang Lan, Xin He, Jia Dong, Jinbiao Jia, Panfeng Guo, Jianming Lin, Miaoliang Huang, Yunfang Huang
The organic-inorganic lead halide perovskite layer is a crucial factor for the high performance perovskite solar cell (PSC). We introduce CH3NH3Br in the precursor solution to prepare CH3NH3PbI3-xBrx hybrid perovskite, and an uniform perovskite layer with improved crystallinity and apparent grain contour is obtained, resulting in the significant improvement of photovoltaic performance of PSCs. The effects of CH3NH3Br on the perovskite morphology, crystallinity, absorption property, charge carrier dynamics and device characteristics are discussed, and the improvement of open circuit voltage of the device depended on Br doping is confirmed...
March 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28303801/ultrathin-al2o3-interface-achieving-an-11-46-efficiency-in-planar-n-si-pedot-pss-hybrid-solar-cells
#8
Yoon-Ho Nam, Jae-Won Song, Min-Joon Park, Abdul Sami, Jung-Ho Lee
Hybrid organic-inorganic photovoltaic devices consisting of poly(3,4-etyhlenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) and n-type silicon have recently been investigated for their cost-efficiency and ease of fabrication. We demonstrate that the insertion of an ultrathin Al2O3 layer between n-Si and PEDOT:PSS significantly improves photovoltaic performance in comparison to the conventional interfacial oxide employing SiO2. A power-conversion efficiency of 11.46% was recorded at the optimal Al2O3 thickness of 2...
April 18, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28301756/hot-charge-carrier-transmission-from-plasmonic-nanostructures
#9
Phillip Christopher, Martin Moskovits
Surface plasmons have recently been harnessed to carry out processes such as photovoltaic current generation, redox photochemistry, photocatalysis, and photodetection, all of which are enabled by separating energetic (hot) electrons and holes-processes that, previously, were the domain of semiconductor junctions. Currently, the power conversion efficiencies of systems using plasmon excitation are low. However, the very large electron/hole per photon quantum efficiencies observed for plasmonic devices fan the hope of future improvements through a deeper understanding of the processes involved and through better device engineering, especially of critical interfaces such as those between metallic and semiconducting nanophases (or adsorbed molecules)...
March 16, 2017: Annual Review of Physical Chemistry
https://www.readbyqxmd.com/read/28301331/electrical-and-photovoltaic-properties-of-residue-free-mos2-thin-films-by-liquid-exfoliation-method
#10
Seung Kyo Lee, Dongil Chu, Da Ye Song, Sang Woo Pak, Eun Kyu Kim
Molybdenum disulphide (MoS2) film fabricated by a liquid exfoliation method has a large potential on various applications because of its various advantages in mass production and low temperature process. In this study, residue-free MoS2 thin films were formed during the liquid exfoliation process and their electrical properties were characterized with interdigitated electrode. Then, MoS2 film thickness could be controlled by centrifuge condition in the range of 20~40 nm, and its carrier concentration and mobility were measured about 7...
March 16, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28301162/determination-of-cell-doubling-times-from-the-return-on-investment-time-of-photosynthetic-vesicles-based-on-atomic-detail-structural-models
#11
Andrew Hitchcock, C Neil Hunter, Melih Sener
Cell doubling times of the purple bacterium Rhodobacter sphaeroides during photosynthetic growth are determined experimentally and computationally as a function of illumination. For this purpose, energy conversion processes in an intracytoplasmic membrane vesicle, the chromatophore, are described based on an atomic detail structural model. The cell doubling time and its illumination dependence are computed in terms of the return-on-investment (ROI) time of the chromatophore, determined computationally from the ATP production rate, and the mass ratio of chromatophores in the cell, determined experimentally from whole cell absorbance spectra...
March 16, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28301159/how-the-structures-and-properties-of-2d-layered-perovskites-mapbi3-and-cspbi3-vary-with-the-number-of-layers
#12
Lei Zhang, WanZhen Liang
This work aims at exploring the intrinsic properties of 2D-layered perovskites, (PEA)2 PbI4(N) and Cs2PbI4(N), and demonstrating how their structures and properties vary with N. The results reveal that both (PEA)2PbI4(N) and Cs2PbI4(N) are direct bandgap semiconductors, their band/optical gaps and exciton-binding energies vary linearly with 1/N at N ≥3, and the effective masses slowly varies with N. Compared to the bulk phases, the structures of ultrathin (PEA)2PbI4(N) are more flexible and deformable than Cs2PbI4(N)...
March 16, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28301133/chemical-interface-damping-depends-on-electrons-reaching-the-surface
#13
Benjamin Foerster, Anneli Joplin, Katharina Kaefer, Sirin Celiksoy, Stephan Link, Carsten Sönnichsen
Metallic nanoparticles show extraordinary strong light absorption near their plasmon resonance, orders of magnitude larger compared to nonmetallic nanoparticles. This "antenna" effect has recently been exploited to transfer electrons into empty states of an attached material, for example to create electric currents in photovoltaic devices or to induce chemical reactions. It is generally assumed that plasmons decay into hot electrons, which then transfer to the attached material. Ultrafast electron-electron scattering reduces the lifetime of hot electrons drastically in metals and therefore strongly limits the efficiency of plasmon induced hot electron transfer...
March 17, 2017: ACS Nano
https://www.readbyqxmd.com/read/28301082/ch3nh3pbbr3-perovskite-nanocrystals-as-efficient-light-harvesting-antenna-for-fluorescence-resonance-energy-transfer
#14
Vijayakumar C Nair, Chinnadurai Muthu, Anuja Vijayan
Hybrid perovskites have created enormous research interest as a low-cost material for high-performance photovoltaic devices, light-emitting diodes, photodetectors, memories and sensors. Perovskite materials in nanocrystal form, show intense luminescence due to quantum confinement effect, were found to be particularly suitable for most of these applications. However, the potential use of perovskite nanocrystals as a light harvesting antenna for possible applications in artificial photosynthesis systems is not yet explored...
March 16, 2017: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/28301059/enantiopure-vs-racemic-naphthalimide-end-capped-helicenic-non-fullerene-electron-acceptors-impact-on-organic-photovoltaics-performance
#15
Jeanne Crassous, Pierre Josse, Ludovic Favereau, Chengshuo Shen, Sylvie Dabos-Seignon, Philippe Blanchard, Clement Cabanetos
Impact of the enantiopurity on organic photovoltaics (OPV) performance was investigated through the synthesis of racemic and enantiomerically pure naphthalimide end-capped helicenes and their application as non-fullerene molecular electron acceptors in OPV devices. A very strong increase of the device performance was observed by simply switching from the racemic to the enantiopure forms of these pi-helical non-fullerene acceptors with power conversion efficiencies jumping from 0.4% to ca 2.0% in air-processed poly(3-hexylthiophene) based devices, thus highlighting the key role of enantiopurity in the photovoltaic properties...
March 16, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28300259/-d-%C3%AF-a-2-%C3%AF-d-a-type-ferrocenyl-bisthiazole-linked-triphenylamine-based-molecular-systems-for-dssc-synthesis-experimental-and-theoretical-performance-studies
#16
Ramesh Maragani, Rajneesh Misra, M S Roy, Manish Kumar Singh, Ganesh D Sharma
We have designed and synthesized ferrocenyl (donor) bisthiazole linked triphenylamine (donor) based donor-π-acceptor-π-donor-acceptor (D-π-A)2-π-D-A type dyes D1 and D2 by using Pd-catalyzed Sonogashira cross-coupling and Knoevenagel condensation reactions. Their photophysical, electrochemical and computational studies reveal strong donor-acceptor interaction. Dye sensitized solar cells (DSSCs) based on D1 and D2 exhibit power conversion efficiencies (PCE) of 6.33% and 5.03%, respectively. The higher PCE value of the D1 based DSSC is attributed to its enhanced short-circuit current (Jsc) and open-circuit current (Voc) and fill factor (FF) values because of the strong binding of the anchoring cyanoacrylic acid with the TiO2 surface as compared to the dicyanovinyl unit in D2...
March 16, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28300145/high-photoresponsivity-ge-dot-photomosfets-for-low-power-monolithically-integrated-si-optical-interconnects
#17
Ming-Hao Kuo, Meng-Chun Lee, Horng-Chih Lin, Tom George, Pei-Wen Li
We report the demonstration of high-photoresponsivity Ge-dot photoMOSFETs in a standard MOS configuration for the detection of 850-1550 nm illumination. Each device has a self-organized, gate-stacking heterostructure of SiO2/Ge-dot/SiO2/SiGe-channel which is simultaneously fabricated in a single oxidation step. Superior control of the geometrical size and chemical composition for our Ge nanodots/SiO2/Si1-xGex-shell MOS structure enables the practically-achievable, gate-stacking design for our Ge-dot photoMOSFETs...
March 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28299942/temperature-dependent-electric-field-poling-effects-in-ch3nh3pbi3-optoelectronic-devices
#18
Chuang Zhang, Dali Sun, Xiaojie Liu, Chuanxiang Sheng, Zeev Valy Vardeny
Organo-lead halide perovskites show excellent optoelectronic properties; however, the unexpected inconsistency in forward/backward I-V characteristics remains a problem for fabricating solar panels. Here we have investigated the reasons behind this "hysteresis" by following the changes in photocurrent/photoluminescence under electric field poling in transverse CH3NH3PbI3-based devices from 300 K to 10 K. We found that the hysteresis disappears at cryogenic temperatures, indicating the "freeze-out" of ionic diffusion contribution...
March 16, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28298084/a-small-molecule-acceptor-based-on-the-heptacyclic-benzodi-cyclopentadithiophene-unit-for-high-efficient-non-fullerene-organic-solar-cells
#19
Bin Kan, Huanran Feng, Xiangjian Wan, Feng Liu, Xin Ke, Yanbo Wang, Yunchuang Wang, Hongtao Zhang, Chenxi Li, Jianhui Hou, Yongsheng Chen
A new acceptor-donor-acceptor (A-D-A) type small molecule, namely NFBDT, with a heptacyclic benzodi(cyclopentadithiophene) (FBDT) unit based on BDT as the central building block, was designed and synthesized. Its optical, electrical, thermal properties and photovoltaic performances were systematically investigated. NFBDT exhibits a low optical bandgap of 1.56 eV resulting in wide and efficient absorption in the range from 600 to 800 nm, and suitable energy levels as an electron acceptor. With the widely used and successful wide bandgap polymer PBDB-T selected as the donor material, an optimized PCE of 10...
March 16, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28295982/light-harvesting-and-photocurrent-generation-in-a-conjugated-polymer-nanoparticle-reduced-graphene-oxide-composite
#20
Amitava Patra, Arnab Ghosh, Bikash Jana, Sourav Maiti, Rajesh Bera, Hiren Ghosh
Polymer - graphene nanocomposites are promising candidates towards light harvesting systems such as photocatalysis, photovoltaics; where significant charge separation occurs due to photoinduced electron transfer. Much attention has been paid to use reduced graphene oxide (r-GO) as template for anchoring various nanomaterials due to its efficient electron accepting and transport property. Here, we have prepared Poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV) nanoparticles from MEH-PPV polymer and investigate the change in photophysical properties due to formation of polymer nanoparticles from molecular state by using steady state and time resolved spectroscopy...
March 14, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
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