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organic photovoltaic

Levi M J Moore, Mithun Bhattacharya, Qi Wu, Sang Gil Youm, Evgueni E Nesterov, Sarah E Morgan
Polymer organic photovoltaic (OPV) device performance is defined by the three-dimensional morphology of the phase separated domains in the active layer. Here, we determine the evolution of morphology through different stages of tailored solvent vapor and thermal processing techniques in air-processed poly(3-hexylthiophene-2,5-diyl):phenyl-C61-butyric acid methyl ester (P3HT:PCBM) based OPV blends. A comparative evaluation of the effect of solvent type used for vapor annealing was performed using grazing incidence wide angle x-ray scattering, atomic force microscopy, and UV-vis spectroscopy to probe the active layer morphology...
June 16, 2017: ACS Applied Materials & Interfaces
Like Huang, Xiaoxiang Sun, Chang Li, Jie Xu, Rui Xu, Yangyang Du, Jian Ni, Hongkun Cai, Juan Li, Ziyang Hu, Jianjun Zhang
Recently, low-temperature solution-processed tin oxide (SnO2) as versatile electron transport layer (ETL) for efficient and robust planar heterojunction (PH) perovskite solar cells (PSCs) has attracted particular attention due to its outstanding properties such as high optical transparency, high electron mobility, and suitable band alignment. However, for most of the reported works, an annealing temperature of 180 °C is generally required. This temperature can reluctantly said to be a low temperature, especially with respect to the flexible application where 180 °C is still a little too high that PET flexible substrate cannot bear...
June 14, 2017: ACS Applied Materials & Interfaces
Jing Zhang, Wei Xu, Peng Sheng, Guangyao Zhao, Daoben Zhu
Organic donor-acceptor (DA) complexes have attracted wide attention in recent decades, resulting in the rapid development of organic binary system electronics. The design and synthesis of organic DA complexes with a variety of component structures have mainly focused on metallicity (or even superconductivity), emission, or ferroelectricity studies. Further efforts have been made in high-performance electronic investigations. The chemical versatility of organic semiconductors provides DA complexes with a great number of possibilities for semiconducting applications...
June 13, 2017: Accounts of Chemical Research
Jae Keun Nam, Myung Sun Jung, Sung Uk Chai, Yung Ji Choi, Dongho Kim, Jong Hyeok Park
Thermal instability of organic-inorganic hybrid perovskites will be an inevitable hurdle for commercialization. Recently, all-inorganic cesium lead halide perovskites, in particular, CsPbI2Br, have emerged as thermally stable and efficient photovoltaic light absorbers. However, the fundamental properties of this material have not been studied in detail. The crystal formation behavior of CsPbI2Br is investigated by examining the surface morphology, crystal structure, and chemical state of the perovskite films...
June 14, 2017: Journal of Physical Chemistry Letters
Chunyu Liu, Dezhong Zhang, Zhiqi Li, Xinyuan Zhang, Wenbin Guo, Liu Zhang, Shengping Ruan, Yongbing Long
To overcome drawbacks of the electron transport layer, such as complex surface defects and unmatched energy levels, we successfully employed a smart semiconductor-metal interfacial nanojunciton in organic solar cells by evaporating an ultrathin Al interlayer onto annealing-free ZnO electron transport layer, resulting in a high fill factor of 73.68% and power conversion efficiency of 9.81%. The construction of ZnO-Al nanojunction could effectively fill the surface defects of ZnO and reduce its work function because of the electron transfer from Al to ZnO by Fermi level equilibrium...
June 21, 2017: ACS Applied Materials & Interfaces
Moustafa El Kass, Brohan Luc, Nicolas Gautier, Solène Béchu, Céline David, Noëlla Lemaitre, Solenn Berson, M Richard-Plouet
Using reflux method with [Ti8O12(H2O)24]Cl8.HCl.7H2O as titanium precursor at 120°C for 24h leads to produce a transparent colloidal solution of nanosized crystallised anatase TiO2. The adjustment of the particle size and composition of the dispersant is monitored through the initial water content while controlling the conversion of propylene carbonate into propylene glycol occuring during reflux. The solutions were processed as thin films in order to produce electron transporting layers in hybrid bulk heterojunction solar cells, using a blend of P3HT-PCBM polymers as absorbers, in inverted architecture...
June 12, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
Jie Zhang, Yinan Zhang, Tao Song, Xinlei Shen, Xuegong Yu, Shuit-Tong Lee, Baoquan Sun, Baohua Jia
Organic-inorganic hybrid solar cells based on n-type crystalline silicon and poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) exhibited promising efficiency along with low-cost fabrication process. In this work, ultra-thin flexible silicon substrates with a thickness down to tens of micrometers were employed to fabricate hybrid solar cells to reduce the usage of silicon materials. In order to improve light trapping ability, nanostructures were built-up on the thin silicon substrates by metal assisted chemical etching method...
June 12, 2017: ACS Applied Materials & Interfaces
Inchan Hwang, Deokjae Choi, Sojeong Lee, Ji Hoon Seo, Ka-Hyun Kim, Ilsun Yoon, Kwanyong Seo
We designed and fabricated a random-size inverted-pyramid-structured polydimethylsiloxane (RSIPS-PDMS) sticker to enhance the light absorption of solar cells and thus increase their efficiency. The fabricated sticker was laminated onto bare glass and crystalline silicon (c-Si) surfaces; consequently, low solar-weighted reflectance values were obtained for these surfaces (6.88 and 17.2%, respectively). In addition, we found that incident light was refracted at the PDMS-air interface of each RSIPS, which redirected the incident power and significantly increased the optical path length in the RSIPS-PDMS sticker which was 14...
June 16, 2017: ACS Applied Materials & Interfaces
Ras Baizureen Roseli, Patrick C Tapping, Tak W Kee
The excited states of conjugated polymers play a central role in their applications in organic solar photovoltaics. The delocalized excited states of conjugated polymers are short-lived (τ < 40 fs) but are imperative in the photovoltaic properties of these materials. Photoexcitation of poly(3-hexylthiophene) (P3HT) induces an excited-state absorption band, but the transitions that are involved are not well understood. In this work, calculations have been performed on P3HT analogues using nonlinear response time-dependent density functional theory to show that an increase in the oligomer length correlates with the dominance of the S1 → S3 transition...
June 9, 2017: Journal of Physical Chemistry Letters
Simon Schundelmeier, Bernd Speiser, Holger F Bettinger, Ralf Einholz
6,13-Bis(tri(isopropyl)silylethynyl)pentacene is a prototypical molecule for organic semiconductor and photovoltaic materials making its electrochemical (redox) properties highly interesting. However, previous cyclic voltammetric studies provide only limited information. Kinetic and persistence information, identification of the oxidation product(s) and their further reaction or oxidation have not been reported. Thus, an extended electrochemical and spectroscopic investigation of this compound is conducted in CH2Cl2 and THF electrolytes at Pt electrodes...
June 7, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
Li Nian, Ke Gao, Yufeng Jiang, Qikun Rong, Xiaowen Hu, Dong Yuan, Feng Liu, Xiaobin Peng, Thomas P Russell, Guofu Zhou
High-efficiency small-molecule-based organic photovoltaics (SM-OPVs) using two electron donors (p-DTS(FBTTh2 )2 and ZnP) with distinctively different absorption and structural features are reported. Such a combination works well and synergically improves device short-circuit current density (Jsc ) to 17.99 mA cm(-2) and fill factor (FF) to 77.19%, yielding a milestone efficiency of 11%. To the best of our knowledge, this is the highest power conversion efficiency reported for SM-OPVs to date and the first time to combine high Jsc over 17 mA cm(-2) and high FF over 77% into one SM-OPV...
June 7, 2017: Advanced Materials
Andriele da Silva Prado, Luciano Almeida Leal, Patrick Pascoal de Brito, Antonio Luciano de Almeida Fonseca, Stefan Blawid, Artemis Marti Ceschin, Rosa Helena Veras Mourão, Antônio Quaresma da Silva Júnior, Demétrio Antonio da Silva Filho, Luiz Antonio Ribeiro Junior, Wiliam Ferreira da Cunha
We present an extensive study of the optical properties of Myrcia sylvatica essential oil with the goal of investigating the suitability of its material system for uses in organic photovoltaics. The methods of extraction, experimental analysis, and theoretical modeling are described in detail. The precise composition of the oil in our samples is determined via gas chromatography, mass spectrometry, and X-ray scattering techniques. The measurements indicate that, indeed, the material system of Myrcia sylvatica essential oil may be successfully employed for the design of organic photovoltaic devices...
July 2017: Journal of Molecular Modeling
Xihong Hu, Hong Jiang, Juan Li, Jiaxin Ma, Dong Yang, Zhike Liu, Fei Gao, Shengzhong Frank Liu
The poor air and thermal stability of organic-inorganic halide perovskite solar cells have hindered their real applications. Here we report the insertion of a chemical vapor deposited graphene between the Au electrode and spiro-OMeTAD in planar perovskite solar cells to block the diffusion of air and Au into the perovskite layer, where the single layer graphene is transferred into the devices by a simple laminated process. After ageing in 45% humidity air for 96 h or thermal annealing at 80 °C for 12 h, more than 94% PCE of the devices with graphene can be maintained, which is much better than that of devices without graphene (∼57%)...
June 6, 2017: Nanoscale
Chao Shen, Wenna Du, Zhiyong Wu, Jun Xing, Son Tung Ha, Qiuyu Shang, Weigao Xu, Qihua Xiong, Xinfeng Liu, Qing Zhang
Recently, organic-inorganic lead halide perovskites have gained great attention for their breakthrough in photovoltaic and optoelectronics. However, their thermal transport properties that affect the device lifetime and stability are still rarely explored. In this work, the thermal conductivity properties of single crystal CH3NH3PbI3 platelets grown by chemical vapor deposition are studied via non-contact micro-photoluminescence (PL) spectroscopy. We developed a measurement methodology and derived expressions suitable for the thermal conductivity extraction for micro-sized perovskites...
June 6, 2017: Nanoscale
Marinos Tountas, Yasemin Topal, Ermioni Polydorou, Anastasia Soultati, Apostolis Verykios, Andreas Kaltzoglou, Theodoros A Papadopoulos, Florian Auras, Kostas Seintis, Mihalis Fakis, Leonidas C Palilis, Dimitris Tsikritzis, Stella Kennou, Matroni Koutsoureli, George Papaioannou, Mustafa Ersoz, Mahmut Kus, Polycarpos Falaras, Dimitris Davazoglou, Panagiotis Argitis, Maria Vasilopoulou
Effective interface engineering has been shown to play a vital role in facilitating efficient charge carrier transport thus boosting the performance of organic photovoltaic devices. Herein we employ water soluble lacunary polyoxometalates (POMs) as multifunctional interlayers between the titanium oxide (TiO2) electron extraction/transport layer and the organic photoactive film to simultaneously enhance the efficiency, lifetime and photostability of polymer solar cells. A significant reduction in work function (WF) of TiO2 upon POM deposition was observed, with the magnitude being controlled by the negative charge of the anion and the selection of the addenda atom (W or Mo)...
June 6, 2017: ACS Applied Materials & Interfaces
Bernhard Siegmund, Andreas Mischok, Johannes Benduhn, Olaf Zeika, Sascha Ullbrich, Frederik Nehm, Matthias Böhm, Donato Spoltore, Hartmut Fröb, Christian Körner, Karl Leo, Koen Vandewal
Blending organic electron donors and acceptors yields intermolecular charge-transfer states with additional optical transitions below their optical gaps. In organic photovoltaic devices, such states play a crucial role and limit the operating voltage. Due to its extremely weak nature, direct intermolecular charge-transfer absorption often remains undetected and unused for photocurrent generation. Here, we use an optical microcavity to increase the typically negligible external quantum efficiency in the spectral region of charge-transfer absorption by more than 40 times, yielding values over 20%...
June 5, 2017: Nature Communications
Sabine Richert, Claudia E Tait, Christiane R Timmel
Photoexcited triplet states play a crucial role in photochemical mechanisms: long known to be of paramount importance in the study of photosynthetic reaction centres, they have more recently also been shown to play a major role in a number of applications in the field of molecular electronics. Their characterisation is crucial for an improved understanding of these processes with a particular focus on the determination of the spatial distribution of the triplet state wavefunction providing information on charge and energy transfer efficiencies...
July 2017: Journal of Magnetic Resonance
Yue Li, Wenjie Zhao, Mengzhen Li, Gang Chen, Wang Xiaofeng, Xueqi Fu, Osamu Kitao, Hitoshi Tamiaki, Tokowa Sakai, Toshitaka Ikeuchi, Shin-Ichi Sasaki
We demonstrate solid-state chlorophyll solar cells (CSCs) employing a carboxylated chlorophyll derivative, methyl trans-32-carboxy-pyropheophorbide a as a light-harvesting dye sensitizer chlorophyll (DSC) deposited on mesoporous TiO2, on which four zinc hydroxylated chlorophyll derivatives were spin-coated for hole transporter chlorophylls (HTCs). The key parameters including the effective carrier mobility of the HTC films determined by the space charge-limited current method and the frontier molecular orbitals of these DSC and HTCs estimated from the cyclic voltammetry and the electronic absorption spectra suggest that both their charge separation and carrier transport are favorable...
June 3, 2017: Chemistry: a European Journal
Makoto Karakawa, Takabumi Nagai
Fulleropyrrolidine derivatives are intrinsically basic owing to the amino group of the pyrrolidine structure. It had been predicted that the basicity of fulleropyrrolidine may affect devices containing an acidic layer (e.g. , PEDOT: PSS). To clarify the effects of basic fulleropyrrolidine derivatives, we synthesized compounds with an N-benzyl substituent group and fabricated organic photovoltaic (OPV) cells using this N-benzyl fulleropyrrolidine. A device structure with ITO / PEDOT:PSS / organic layer (PTB7:fulleropyrrolidine) / Ca / Al showed high series resistance, low Jsc and low FF values...
June 2, 2017: ACS Applied Materials & Interfaces
Wanning Li, Huifeng Yao, Hao Zhang, Sunsun Li, Jianhui Hou
Over the past decades, fullerene derivatives have become the most successful electron acceptors in the organic solar cells (OSCs) and have achieved great progress, showing power conversion efficiencies (PCEs) of over 11%. However, fullerenes have some drawbacks such as weak absorption, limited energy-level tunability, and morphological instability. In addition, fullerene-based OSCs usually suffer from large energy losses of over 0.7 eV, which limits further improvement of the PCE. Recently, non-fullerene small molecules have emerged as promising electron acceptors in OSCs...
June 2, 2017: Chemistry, An Asian Journal
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