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organic photovoltaic

Bimalendu Adhikari, Xu Lin, Mitsuaki Yamauchi, Hayato Ouchi, Keisuke Aratsu, Shiki Yagai
Hydrogen-bonded supermacrocycles (rosettes) are attractive disk-shaped noncovalent synthons for extended functional columnar nanoassemblies. They can serve not only as noncovalent monomer units for supramolecular polymers and discrete oligomers in a dilute solution but also as constituent entities for soft matters such as gels and lyotropic/thermotropic liquid crystals. However, what are the merits of using supramolecular rosettes instead of using expanded π-conjugated covalent molecules? This review covers the self-assembly of photochemically and electrochemically active π-conjugated molecules through the formation of supramolecular rosettes via directional complementary multiple hydrogen-bonding interactions...
August 16, 2017: Chemical Communications: Chem Comm
Xinwei Chen, Si-Lu Tao, Cong Fan, Dongcheng Chen, Ling Zhou, Hui Lin, Cai-Jun Zheng, Shi-Jian Su
Ternary bulk heterojunction (BHJ) is a brilliant photovoltaic technology for improving the performance of organic solar cells (OSCs), since the light absorption range can be significantly extended by using multiple donors or acceptor materials. In this paper, coumarin7 (C7), a small organic molecule typical led used in organic light-emitting diodes, was initially exploited as second electron-donor component in ternary bulk heterojunction OSCs along with conventional blend system spolythieno[3,4-b]-thiophene/benzodithiophene(PTB7) and [6,6]-phenyl-C71 -butyric acid methyl(PC71 BM)...
August 15, 2017: ACS Applied Materials & Interfaces
Quentin Arnoux, Anthony Boucly, Vincent Barth, Rabah Benbalagh, Albano Cossaro, Luca Floreano, Mathieu G Silly, Fausto Sirotti, Etienne Derat, Stephane Carniato, Fabrice Bournel, Jean-Jacques Gallet, Denis Fichou, Ludovic Tortech, Francois Rochet
2,2',6,6'-tetraphenyl-4,4'-dipyranylidene (DIPO-Ph4) was grown by vacuum-deposition on an indium tin oxide (ITO) substrate. The films were characterized by atomic force microscopy and synchrotron radiation UV and X-ray photoelectron spectroscopy to gain an insight into the material growth and to better understand the electronic properties of the DIPO-Ph4/ITO interface. Results show formation of cationic DIPO-Ph4 at ITO interface with a charge transfer from the organic layer to the anode material. This has been confronted to DFT calculations...
August 14, 2017: ACS Applied Materials & Interfaces
Zhi-Wen Zhao, Qing-Qing Pan, Shuang-Bao Li, Yu-Ai Duan, Yun Geng, Min Zhang, Zhong-Min Su
A series of polymer donor materials 1-5 based on diketopyrrolopyrrole and thiophene unit which have been widely used in organic solar cells (OSCs) were investigated based on quantum chemical calculations. The effect of fluorine and cyano substitutions in polymer donor materials was focused on. Based on the investigation on electronic structures and optical properties of the reported molecules 1 and 2 and the analysis on some parameters relevant to charge dissociation ability at donor/acceptor interface constituted by 1 and 2 with PC61BM such as intermolecular charge transfer and recombination, driving force and Coulombic bound energy, we explained why fluorine substitution can improve OPV efficiency through strengthening eletron-withdrawing ability from a theoretical perspective...
August 2, 2017: Journal of Molecular Graphics & Modelling
Alexander A Chistyakov, Mariya A Zvaigzne, Vladimir R Nikitenko, Alexey R Tameev, Igor L Martynov, Oleg V Prezhdo
Quantum dot (QD) solids represents a new type of condensed matter that is highly relevant from both fundamental and applied points of view. The properties of QD solids are qualitatively different from those of the traditional solids, and their unique characteristics give rise to promising applications. The combination of quantum confinement in individual QDs with macroscopic scale of the whole material leads to novel features of electronic excitations (excitons) and charge transfer processes, which are of great interest for optoelectronic applications...
August 11, 2017: Journal of Physical Chemistry Letters
Xavier A Jeanbourquin, Aiman Rahmanudin, Xiaoyun Yu, Melissa Johnson, Néstor Guijarro, Liang Yao, Kevin Sivula
Ternary bulk heterojunctions with cascade-type energy-level configurations are of significant interest for further improving the power conversion efficiency (PCE) of organic solar cells. However, controlling the self-assembly in solution-processed ternary blends remains a key challenge. Herein, we leverage the ability to control the crystallinity of molecular semiconductors via a spiro linker to demonstrate a simple strategy suggested to drive the self-assembly of an ideal charge-cascade morphology. Spirobifluorene (SF) derivatives with optimized energy levels from diketopyrrolopyrrole (DPP) or perylenediimide (PDI) components, coded as SF-(DPP)4 and SF-(PDI)4, are synthesized and investigated for application as ternary components in the host blend of poly(3-hexylthiophene-2,5-diyl):[6,6]phenyl-C61-butyric acid methyl ester (P3HT:PCBM)...
August 10, 2017: ACS Applied Materials & Interfaces
Huan Wang, Dong Ha Kim
While the field of perovskite-based optoelectronics has mostly been dominated by photovoltaics, light-emitting diodes, and transistors, semiconducting properties peculiar to perovskites make them interesting candidates for innovative and disruptive applications in light signal detection. Perovskites combine effective light absorption in the broadband range with good photo-generation yield and high charge carrier mobility, a combination that provides promising potential for exploiting sensitive and fast photodetectors that are targeted for image sensing, optical communication, environmental monitoring or chemical/biological detection...
August 10, 2017: Chemical Society Reviews
Ramanan Ehamparam, Luis E Oquendo, Michael W Liao, Ambjorn Karl Brynnel, Kai-Lin Ou, Neal R Armstrong, Dominic V McGrath, S Scott Saavedra
The efficiency of charge collection at the organic/transparent conducting oxide (TCO) interface in organic photovoltaic (OPV) devices affects overall device efficiency. Modifying the TCO with an electrochemically active molecule may enhance OPV efficiency by providing a charge-transfer pathway between the electrode and the organic active layer, and may also mitigate surface recombination. The synthesis and characterization of phosphonic acid-ruthenium phthalocyanine (RuPcPA) monolayer films on indium tin oxide (ITO), designed to facilitate charge harvesting at ITO electrodes, is presented in this work...
August 10, 2017: ACS Applied Materials & Interfaces
Hua Sun, Xin Song, Jian Xie, Po Sun, Peiyang Gu, Chang Mei Liu, Fei Chen, Qi Chun Zhang, Zhi-Kuan Chen, Wei Huang
A perylenediimide (PDI)-based small molecular (SM) acceptor with both an extended π-conjugation and a three dimensional structure concurrently is critical for achieving high performance PDI-based fullerene-free organic solar cells (OSCs). In this work, we designed and synthesized a novel PDI-based SM acceptor possessing both characteristics by fusing PDI units with a spiro core of 4,4'-spirobi[cyclopenta[2,1-b;3,4-b']dithiophene(SCPDT) through the -position of the thiophene rings. An enhanced strong absorption in the range of 350-520 nm and arisen LUMO energy level of FSP was observed, compared with previous reported acceptor SCPDT-PDI4, in which the PDI units and SCPDT are not fused...
August 10, 2017: ACS Applied Materials & Interfaces
Fahmi F Muhammad, Mohd Y Yahya, Shilan S Hameed, Fakhra Aziz, Khaulah Sulaiman, Mariwan A Rasheed, Zubair Ahmad
In this research work, numerical simulations are performed to correlate the photovoltaic parameters with various internal and external factors influencing the performance of solar cells. Single-diode modeling approach is utilized for this purpose and theoretical investigations are compared with the reported experimental evidences for organic and inorganic solar cells at various electrical and thermal conditions. Electrical parameters include parasitic resistances (Rs and Rp) and ideality factor (n), while thermal parameters can be defined by the cells temperature (T)...
2017: PloS One
Sang Woo Seo, Ha Seung Lee, Dong Hee Shin, Ju Hwan Kim, Chan Wook Jang, Jong Min Kim, Sung Kim, Suk-Ho Choi
We first employ highly-stable and -flexible (CF<sub>3</sub>SO<sub>2</sub>)<sub>2</sub>NH-doped graphene (TFSA/GR) and GR-encapsulated TFSA/GR (GR/TFSA/GR) transparent conductive electrodes (TCEs) prepared on polyethylene terephthalate substrates for flexible organic solar cells (OSCs). Compared to conventional indium tin oxide (ITO) TCEs, the TFSA-doped-GR TCEs show higher optical transmittance and larger sheet resistance. The TFSA/GR and GR/TFSA/GR TCEs show work functions of 4...
August 9, 2017: Nanotechnology
J L Aragones, A Alexander-Katz
Stacking of disk-shaped organic molecules is a promising strategy to develop electronic and photovoltaic devices. Here, we investigate the capability of a soft block copolymer matrix that microphase separates into a cylindrical phase to direct the self-assembly of disk-shaped molecules by means of molecular simulations. We show that two disk molecules confined in the cylinder domain experience a depletion force, induced by the polymer chains, which results in the formation of stacks of disks. This entropic interaction and the soft confinement provided by the matrix are both responsible for the structures that can be self-assembled, which include slanted or columnar stacks...
August 7, 2017: Journal of Chemical Physics
Xuexi Sheng, Ying Liu, Yu Wang, Yafei Li, Xun Wang, Xinping Wang, Zhihui Dai, Jianchun Bao, Xiangxing Xu
Perovskite structured CsPbX3 (X = Cl, Br or I) quantum dots (QDs) have attracted great attention in the past few years for appealing application potentials in photovoltaic and optoelectronic devices. In this report, the CsPbX3 QDs are shown to perform as a new probe for metal ions with high sensitivity, high selectivity and instant response by the quenching or enhancing of the photoluminescence (PL). Through experimental and calculation efforts, the probing mechanisms are investigated. A wide probing window for Cu(2+) and Yb(3+) ions ranging from 2 × 10(-9) to 2 × 10(-6) m is exhibited for CsPbBr3 QDs...
August 7, 2017: Advanced Materials
Johannes R Klein, Mirko Scholz, Kawon Oum, Thomas Lenzer
We present a comprehensive steady-state and time-resolved UV-Vis-NIR absorption and fluorescence study of the hole-transport material H101 to characterise its photophysics in different organic solvents and on mesoporous Al2O3 and TiO2 thin films. Photoexcitation of H101 at 400 nm in organic solvents populates the S1 state which shows intramolecular relaxation on a picosecond time scale. Branching from the relaxed S1 state leads to population of the T1 triplet state and the ground electronic state S0. Triplet formation is induced by the internal heavy-atom effect of the sulphur atom, and the triplet yield decreases substantially with solvent polarity...
August 16, 2017: Physical Chemistry Chemical Physics: PCCP
Elisa Collado-Fregoso, Samantha N Hood, Safa Shoaee, Bob C Schroeder, Iain McCulloch, Ivan Kassal, Dieter Neher, James R Durrant
In this Letter, we study the role of the donor:acceptor interface nanostructure upon charge separation and recombination in organic photovoltaic devices and blend films, using mixtures of PBTTT and two different fullerene derivatives (PC70BM and ICTA) as models for intercalated and nonintercalated morphologies, respectively. Thermodynamic simulations show that while the completely intercalated system exhibits a large free-energy barrier for charge separation, this barrier is significantly lower in the nonintercalated system and almost vanishes when energetic disorder is included in the model...
August 16, 2017: Journal of Physical Chemistry Letters
Eui Jin Lee, Min Hee Choi, Doo Kyung Moon
In this study, we fabricated organic photovoltaics (OPVs) by introducing the polymer additive HTh6BT into the photoactive layer of a poly(3-hexylthiophene):phenyl-C61-butyric acid methyl ester (P3HT:PCBM) system. The HTh6BT had a relatively low band gap energy of 1.65 eV and a molecular and crystalline structure similar to that of P3HT. In the photoactive layer, the HTh6BT and P3HT can both act as donors. In such parallel-type bulk heterojunctions, each donor can form excitons and generate charges while being separated from the donor/acceptor interface...
December 8, 2016: Materials
Wouter Marchal, Inge Verboven, Jurgen Kesters, Boaz Moeremans, Christopher De Dobbelaere, Gilles Bonneux, Ken Elen, Bert Conings, Wouter Maes, Hans Gerd Boyen, Wim Deferme, Marlies Van Bael, An Hardy
The identification, fine-tuning, and process optimization of appropriate hole transporting layers (HTLs) for organic solar cells is indispensable for the production of efficient and sustainable functional devices. In this study, the optimization of a solution-processed molybdenum oxide (MoOx) layer fabricated from a combustion precursor is carried out via the introduction of zirconium and tin additives. The evaluation of the output characteristics of both organic photovoltaic (OPV) and organic light emitting diode (OLED) devices demonstrates the beneficial influence upon the addition of the Zr and Sn ions compared to the generic MoOx precursor...
January 30, 2017: Materials
Huei-Ting Chien, Peter Wilhelm Zach, Bettina Friedel
In this study, we focus on induced degradation and spatial inhomogeneity of organic photovoltaic devices under different environmental conditions, uncoupled from the influence of any auxiliary hole-transport (HT) layer. During testing of according devices comprising the standard photoactive layer of poly(3-hexylthiophene) (P3HT) as donor, blended with phenyl-C61-butyric acid methyl ester (PC60BM) as acceptor, a comparison was made between non-encapsulated devices upon exposure to argon in the dark, dry air in the dark, dry air with illumination and humid air in the dark...
August 3, 2017: ACS Applied Materials & Interfaces
Yang-Yen Yu, Chien-Hsun Chen, Chu-Chen Chueh, Chun-Ying Chiang, Jang-Hsing Hsieh, Chih-Ping Chen, Wen-Chang Chen
In this study, a new hybrid electrode featuring a high gauge factor of >30, decent stretchability (100% of the original conductivity can be retained after 50 cycles of stretching under a 20% strain without prestrain treatment), high transmittance (>70%) across 400-900 nm, and a good sheet resistance (<50 Ω sq(-1)) was successfully exploited. These superior properties were revealed to originate from the reversible phase separation endowed by the nanogranular-like morphology formed in Ag. Owing to such discrete nanomorphology, the free volume within this Ag electrode is susceptible to the applied tensile strain and the ensuing change in conductivity enables the realization of an efficient strain sensor...
August 9, 2017: ACS Applied Materials & Interfaces
Chengsheng Ni, Gordon Hedley, Julia Payne, Vladimir Svrcek, Calum McDonald, Lethy Krishnan Jagadamma, Paul Edwards, Robert Martin, Gunisha Jain, Darragh Carolan, Davide Mariotti, Paul Maguire, Ifor Samuel, John Irvine
A metal-organic hybrid perovskite (CH3NH3PbI3) with three-dimensional framework of metal-halide octahedra has been reported as a low-cost, solution-processable absorber for a thin-film solar cell with a power-conversion efficiency over 20%. Low-dimensional layered perovskites with metal halide slabs separated by the insulating organic layers are reported to show higher stability, but the efficiencies of the solar cells are limited by the confinement of excitons. In order to explore the confinement and transport of excitons in zero-dimensional metal-organic hybrid materials, a highly orientated film of (CH3NH3)3Bi2I9 with nanometre-sized core clusters of Bi2I9(3-) surrounded by insulating CH3NH3(+) was prepared via solution processing...
August 1, 2017: Nature Communications
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