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organic photovoltaic

Jia Liang, Peiyang Zhao, Caixing Wang, Yanrong Wang, Yi Hu, Guoyin Zhu, Lianbo Ma, Jie Liu, Zhong Jin
The emergence of perovskite solar cells (PSCs) has generated enormous interests in the photovoltaic research community. Recently, cesium metal halides (CsMX3, M = Pb or Sn; X = I, Br, Cl or mixed halides) as a class of inorganic perovskites showed great promise for PSCs and other optoelectronic devices. However, CsMX3-based PSCs usually exhibit lower power conversion efficiencies (PCEs) than organic-inorganic hybrid PSCs, due to the unfavorable bandgaps. Herein, a novel mixed-Pb/Sn mixed-halide inorganic perovskite, CsPb0...
September 21, 2017: Journal of the American Chemical Society
Xiongfeng Lin, Askhat N Jumabekov, Niraj N Lal, Alexander R Pascoe, Daniel E Gómez, Noel W Duffy, Anthony S R Chesman, Kallista Sears, Maxime Fournier, Yupeng Zhang, Qiaoliang Bao, Yi-Bing Cheng, Leone Spiccia, Udo Bach
Hybrid organic-inorganic halide perovskites are low-cost solution-processable solar cell materials with photovoltaic properties that rival those of crystalline silicon. The perovskite films are typically sandwiched between thin layers of hole and electron transport materials, which efficiently extract photogenerated charges. This affords high-energy conversion efficiencies but results in significant performance and fabrication challenges. Herein we present a simple charge transport layer-free perovskite solar cell, comprising only a perovskite layer with two interdigitated gold back-contacts...
September 20, 2017: Nature Communications
Nobuhiro Yanai, Nobuo Kimizuka
Photon upconversion based on triplet-triplet annihilation (TTA-UC) has attracted much interest because of its possible applications to renewable energy production and biological fields. In particular, the UC of near-infrared (NIR) light to visible (vis) light is imperative to overcome the Shockley-Queisser limit of single-junction photovoltaic cells, and the efficiency of photocatalytic hydrogen production from water can also be improved with the aid of vis-to-ultraviolet (UV) UC. However, both processes have met limitations in the wavelength range, efficiency, and sensitivity for weak incident light...
September 20, 2017: Accounts of Chemical Research
Yun Geng, Myeong H Lee, Alessandro Troisi
The nature and dynamics of the bound charge transfer (CT) state in the exciton dissociation process in organic solar cell is of critical importance for the understanding of these devices. It was recently demonstrated that this state can be probed by a new experiment where an infrared (IR) push-pulse is used to dissociate charges from the bound excited state. Here we proposed a simple quantum dynamics model to simulate the excitation of IR pulse on the bound CT state with model parameters extracted from quantum chemical calculations...
September 19, 2017: Journal of Physical Chemistry Letters
Alexander Grupp, Philipp Ehrenreich, Julian Kalb, Arne Budweg, Lukas Schmidt-Mende, Daniele Brida
In this work, we investigate the exciton dissociation dynamics occurring at the donor-acceptor interface in organic and hybrid blends employed in the realization of photovoltaic cells. Fundamental differences in the charge separation process are studied with the organic semiconductor polymer poly(3-hexylthiophene) (P3HT) and either [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) or titanium dioxide (TiO2) acting as acceptor. By using ultrafast broadband transient absorption spectroscopy with few-fs temporal resolution, we observe that in both cases the incoherent formation of free charges is dominating the charge generation process...
September 19, 2017: Journal of Physical Chemistry Letters
Samuel B Penwell, Lucas D S Ginsberg, Rodrigo Noriega, Naomi S Ginsberg
Effectiveness of molecular-based light harvesting relies on transport of excitons to charge-transfer sites. Measuring exciton migration, however, has been challenging because of the mismatch between nanoscale migration lengths and the diffraction limit. Instead of using bulk substrate quenching methods, here we define quenching boundaries all-optically with sub-diffraction resolution, thus characterizing spatiotemporal exciton migration on its native nanometre and picosecond scales. By transforming stimulated emission depletion microscopy into a time-resolved ultrafast approach, we measure a 16-nm migration length in poly(2,5-di(hexyloxy)cyanoterephthalylidene) conjugated polymer films...
September 18, 2017: Nature Materials
Malihe Khalili, Mohammad Abedi, Hossein Salar Amoli, Seyed Ahmad Mozaffari
In commercialization of liquid dye-sensitized solar cells (DSSCs), whose leakage, evaporation and toxicity of organic solvents are limiting factors, replacement of organic solvents with water-based gel electrolyte is recommended. This work reports on utilizing and comparison of chitosan and chitosan nanoparticle as different gelling agents in preparation of water-based gel electrolyte in fabrication of dye sensitized solar cells. All photovoltaic parameters such as open circuit voltage (Voc), fill factor (FF), short circuit current density (Jsc) and conversion efficiency (η) were measured...
November 1, 2017: Carbohydrate Polymers
Huawei Hu, Philip C Y Chow, Guangye Zhang, Tingxuan Ma, Jing Liu, Guofang Yang, He Yan
Bulk heterojunction (BHJ) organic solar cells (OSCs) have attracted intensive research attention over the past two decades owing to their unique advantages including mechanical flexibility, light weight, large area, and low-cost fabrications. To date, OSC devices have achieved power conversion efficiencies (PCEs) exceeding 12%. Much of the progress was enabled by the development of high-performance donor polymers with favorable morphological, electronic, and optical properties. A key problem in morphology control of OSCs is the trade-off between achieving small domain size and high polymer crystallinity, which is especially important for the realization of efficient thick-film devices with high fill factors...
September 15, 2017: Accounts of Chemical Research
Mahshid Ahmadi, Ting Wu, Bin Hu
The last eight years (2009-2017) have seen an explosive growth of interest in organic-inorganic halide perovskites in the research communities of photovoltaics and light-emitting diodes. In addition, recent advancements have demonstrated that this type of perovskite has a great potential in the technology of light-signal detection with a comparable performance to commercially available crystalline Si and III-V photodetectors. The contemporary growth of state-of-the-art multifunctional perovskites in the field of light-signal detection has benefited from its outstanding intrinsic optoelectronic properties, including photoinduced polarization, high drift mobilities, and effective charge collection, which are excellent for this application...
September 14, 2017: Advanced Materials
Sheng-Peng Jiang, Mengmeng Zhang, Cheng-Yu Wang, Shangfeng Yang, Guan-Wu Wang
The copper-promoted cascade radical reaction of N-sulfonyl-2-allylanilines with [60]fullerene has been developed to efficiently provide novel and scarce (2-indolinyl)methylated hydrofullerenes, featuring a broad substrate scope and excellent functional group tolerance. A plausible reaction mechanism for the formation of (2-indolinyl)methylated hydrofullerenes is proposed on the basis of the experimental results. In addition, further transformation into other carbocyclic derivatives of [60]fullerene as well as their applications in organic photovoltaic devices of the obtained products has also been explored...
September 14, 2017: Organic Letters
Daniele Fazzi, Mario Barbatti, Walter Thiel
The evolution of the excited-state manifold in organic D/A aggregates (e.g. the prototypical P3HT/PCBM) is investigated through a bottom-up approach via first-principles calculations. We show how the excited-state energies, the charge transfer (CT) states, and the electron-hole density distributions are strongly influenced by the size, the orientation and the position (i.e. on-top vs. on-edge phases) of P3HT/PCBM domains. We discuss how the structural order influences the excited-state electronic structure, providing an atomistic interpretation of the photophysics of organic blends...
September 13, 2017: Journal of Physical Chemistry Letters
Abby-Jo Payne, Shi Li, Sergey V Dayneko, Chad Risko, Gregory C Welch
Correction for 'An unsymmetrical non-fullerene acceptor: synthesis via direct heteroarylation, self-assembly, and utility as a low energy absorber in organic photovoltaic cells' by Abby-Jo Payne et al., Chem. Commun., 2017, 53, 10168-10171.
September 21, 2017: Chemical Communications: Chem Comm
Cai'e Zhang, Shiyu Feng, Yahui Liu, Ran Hou, Zhe Zhang, Xinjun Xu, Youzhi Wu, Zhishan Bo
Three indacenodithieno[3,2-b]thiophene (IT) cored small molecular acceptors (ITIC-SC6, ITIC-SC8 and ITIC-SC2C6) were synthesized and the influence of side chains on their performances in solar cells was systematically probed. Our investigations have demonstrated the variation of side chains greatly affects the charge dissociation, charge mobility and morphology of the donor:acceptor blend films. ITIC-SC2C6 with four branched side chains showed improved solubility, which can ensure the polymer donor to form favourable fibrous nanostructure during the drying of the blend film...
September 12, 2017: ACS Applied Materials & Interfaces
Olga Nazarenko, Martin Robert Kotyrba, Michael Wörle, Eduardo Cuervo-Reyes, Sergii Yakunin, Maksym V Kovalenko
Interest in hybrid organic-inorganic lead halide compounds with perovskite-like two-dimensional crystal structures is growing due to the unique electronic and optoelectronic properties of these compounds. Herein, we demonstrate the synthesis, thermal and optical properties, and calculations of the electronic band structures for one- and two-layer compounds comprising both cesium and guanidinium cations: Cs[C(NH2)3]PbI4 (I), Cs[C(NH2)3]PbBr4 (II), and Cs2[C(NH2)3]Pb2Br7 (III). Compounds I and II exhibit intense photoluminescence at low temperatures, whereas compound III is emissive at room temperature...
September 12, 2017: Inorganic Chemistry
Mao Mao, Jian-Bo Wang, Xiu-Lin Liu, Guo-Hua Wu, Xia-Qin Fang, Qin-Hua Song
A series of organic dyes based on quinoline as an electron-deficient π-linker, were designed and synthesized for dye sensitized solar cells (DSSC) application. These push-pull conjugated dyes, sharing same anchoring group with distinctive electron-rich donating groups such as N,N-diethyl (DEA-Q), 3,6-dimethoxy carbazole (CBZ-Q), bis(4-butoxyphenyl)amine (BPA-Q), were synthesized by Riley oxidation of CH3 followed by Knoevenagel condensation of the corresponding aldehyde precursors 2a-c with cyanoacrylic acid...
September 4, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
Dominik Kubicki, Daniel Prochowicz, Albert Hofstetter, Shaik M Zakeeruddin, Michael Grätzel, Lyndon Emsley
Hybrid (organic-inorganic) multi-cation lead halide perovskites hold promise for a new generation of easily processable solar cells. Best performing compositions to date are multiple-cation solid alloys of formamidinium (FA), methylammonium (MA), cesium and rubidium lead halides which provide power conversion efficiencies up to around 22%. Here, we elucidate the atomic level nature of Cs and Rb incorporation into the perovskite lattice of FA-based materials. We use 133Cs, 87Rb, 39K, 13C and 14N solid-state MAS NMR to probe microscopic composition of Cs-, Rb-, K-, MA- and FA-containing phases in double-, triple- and quadruple-cation lead halides in bulk and in a thin film...
September 11, 2017: Journal of the American Chemical Society
Shenghua Liu, Shenghuang Lin, Peng You, Charles Surya, Shu Ping Lau, Feng Yan
Although organic photovoltaics (OPVs) have been investigated for more than 2 decades, the power conversion efficiencies of OPVs are much lower than those of inorganic or perovskite solar cells. One effective approach to improve the efficiency of OPVs is to introduce additives to enhance light harvesting as well as charge transportation in the devices. Here, black phosphorus quantum dots (BPQDs) are introduced in OPVs as an additive for the first time. By adding BPQDs with the weight percentage of only 0.055 % relative to polymer donors in the OPVs, the device efficiencies can be dramatically improved for more than 10%...
September 11, 2017: Angewandte Chemie
Alexander D Carl, Roghi E Kalan, John David Obayemi, Martiale Gaetan Zebaze Kana, Winston Oluwole Soboyejo, Ronald L Grimm
We investigated synthetic strategies for the functionalization of Si(111) surfaces with organic species containing amine moieties. We employed the functionalized surfaces to chemically "glue" perovskites to silicon with efficient electron transfer and minimal oxidation leading to deleterious recombination at the silicon substrate. A two-step halogenation-alkylation reaction produced a mixed allyl-methyl monolayer on Si(111). Subsequent reactions utilized multiple methods of brominating the allyl double bond including reaction with HBr in acetic acid, HBr in THF, and molecular bromine in dichloromethane...
September 20, 2017: ACS Applied Materials & Interfaces
Gyu Min Kim, Tetsu Tatsuma
Semi-transparent solar cells draw a great deal of attention because their applications include, for instance, photovoltaic windows. General approach to semi-transparent cells is using thin active layers or island-type structures. Here we take human luminosity function into account, and develop solar cells that harvest photons in the wavelength regions in which human eyes are less sensitive to light. We used an organic-inorganic hybrid perovskite, which is sensitive to light particularly in the blue and deep-blue regions, and plasmonic silver nanocubes that enhance light harvesting in the red and deep-red ranges...
September 6, 2017: Scientific Reports
Joscha Hoche, Hans-Christian Schmitt, Alexander Humeniuk, Ingo Fischer, Roland Mitrić, Merle I S Röhr
The understanding of excimer formation in organic materials is of fundamental importance, since excimers profoundly influence their functional performance in applications such as light-harvesting, photovoltaics or organic electronics. We present a joint experimental and theoretical study of the ultrafast dynamics of excimer formation in the pyrene dimer in a supersonic jet, which is the archetype of an excimer forming system. We perform simulations of the nonadiabatic photodynamics in the frame of TDDFT that reveal two distinct excimer formation pathways in the gas-phase dimer...
September 20, 2017: Physical Chemistry Chemical Physics: PCCP
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