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Solar photovoltaic

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
Paola Vivo, Jagadish K Salunke, Arri Priimagi
Perovskite solar cells (PSCs) represent undoubtedly the most significant breakthrough in photovoltaic technology since the 1970s, with an increase in their power conversion efficiency from less than 5% to over 22% in just a few years. Hole-transporting materials (HTMs) are an essential building block of PSC architectures. Currently, 2,2',7,7'-tetrakis-(N,N'-di-p-methoxyphenylamine)-9,9'-spirobifluorene), better known as spiro-OMeTAD, is the most widely-used HTM to obtain high-efficiency devices. However, it is a tremendously expensive material with mediocre hole carrier mobility...
September 15, 2017: Materials
Kang Wang, Wenjing Zhao, Jia Liu, Jinzhi Niu, Yucheng Liu, Xiaodong Ren, Jiangshan Feng, Zhike Liu, Jie Sun, Dapeng Wang, Shengzhong Frank Liu
Perovskite solar cells (PSCs) have received great attention due to their excellent photovoltaic properties especially for the comparable efficiency to silicon solar cells. The electron transport layer (ETL) is regarded as a crucial medium in transporting electrons and blocking holes for PSCs. In this study, CO2 plasma generated by plasma-enhanced chemical vapor deposition (PECVD) was introduced to modify the TiO2 ETL. The results indicated that CO2 plasma treated compact TiO2 layer exhibited better surface hydrophilicity, higher conductivity, and lower bulk defect state density in comparison with the pristine TiO2 film...
September 15, 2017: ACS Applied Materials & Interfaces
Sadia Islam Shachi, Ali Newaz Bahar
The dataset of physical properties for the proposed CIGS solar cell with Cd-free AlGaAs buffer layer has been depicted in this data article. The cell performance outcome due to different AlGaAs buffer layer band gap is reported along with optimum solar cell performance parameters for instance, open circuit voltage [Formula: see text], short circuit current density ([Formula: see text], fill factor [Formula: see text], efficiency [Formula: see text], as well as collection efficiency [Formula: see text].
October 2017: Data in Brief
Xudong Wang, Chunhua Yao, Fei Wang, Zhaodong Li
Cellulose is the most abundant natural polymer on earth, providing a sustainable green resource that is renewable, degradable, biocompatible, and cost effective. Recently, nanocellulose-based mesoporous structures, flexible thin films, fibers, and networks are increasingly developed and used in photovoltaic devices, energy storage systems, mechanical energy harvesters, and catalysts components, showing tremendous materials science value and application potential in many energy-related fields. In this Review, the most recent advancements of processing, integration, and application of cellulose nanomaterials in the areas of solar energy harvesting, energy storage, and mechanical energy harvesting are reviewed...
September 13, 2017: Small
Xiao Yang, Li Ji, Xingli Zou, Taeho Lim, Ji Zhao, Edward T Yu, Allen J Bard
Electrodeposition of Si films from a Si-containing electrolyte is a cost-effective approach for the manufacturing of solar cells. Proposals relying on molten salts have suffered from low product quality due to difficulties in impurity control. Here we demonstrate a novel approach to electrodeposit high quality Si films from a CaCl2-based molten salt. Soluble SiIV-O anions generated from solid SiO2 are electrodeposited onto a graphite substrate to form a uniform layer of crystalline Si. Impurities in the deposited Si film are controlled at low concentrations (both B and P are less than 1 ppm)...
September 13, 2017: Angewandte Chemie
Zhiyong Liu, Shengli Niu, Ning Wang
A low-temperature, solution-processed molybdenum oxide (MoOX) layer and a facile method for polymer solar cells (PSCs) is developed. The PSCs based on a MoOX layer as the hole extraction layer (HEL) is a significant advance for achieving higher photovoltaic performance, especially under weaker light illumination intensity. Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) measurements show that the (NH4)6Mo7O24 molecule decomposes and forms the molybdenum oxide (MoOX) molecule when undergoing thermal annealing treatment...
September 7, 2017: Journal of Colloid and Interface Science
WenBo Xiao, Gina Nazario, HuaMing Wu, HuaMing Zhang, Feng Cheng
In this article, we introduced an artificial neural network (ANN) based computational model to predict the output power of three types of photovoltaic cells, mono-crystalline (mono-), multi-crystalline (multi-), and amorphous (amor-) crystalline. The prediction results are very close to the experimental data, and were also influenced by numbers of hidden neurons. The order of the solar generation power output influenced by the external conditions from smallest to biggest is: multi-, mono-, and amor- crystalline silicon cells...
2017: PloS One
Yanmei Xin, Xiang Kan, Li-Yong Gan, Zhonghai Zhang
Solar-driven overall water splitting is highly desirable for hydrogen generation with sustainable energy sources, which need efficient, earth-abundant, robust, and bifunctional electrocatalysts for both oxygen evolution reaction (OER) and hydrogen evolution reaction (HER). Herein, we propose a heterogeneous bimetallic phosphide/sulfide nanocomposite electrocatalyst of NiFeSP on nickel foam (NiFeSP/NF), which shows superior electrocatalytic activity of low overpotentials of 91 mV at -10 mA cm(-2) for HER and of 240 mV at 50 mA cm(-2) for OER in 1 M KOH solution...
September 14, 2017: ACS Nano
Shigeru Nakatsuka, Shunsuke Akari, Jakapan Chantana, Takashi Minemoto, Yoshitaro Nose
We report on the optimization of interface structure in ZnSnP2 solar cells. The effects of back electrode materials and related interface on photovoltaic performance were investigated. It was clarified that a conventional structure Mo/ZnSnP2 showed a schottky-behaviour, while an ohmic-behaviour was observed in the Cu/ZnSnP2 structure annealed at 300 °C. STEM-EDX analysis suggested that Cu-Sn-P ternary compound was formed at the interface. This compound is considered to play an important role to obtain the ohmic contact between ZnSnP2 and Cu...
September 12, 2017: ACS Applied Materials & Interfaces
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
Pantea Aurang, Rasit Turan, Husnu Emrah Unalan
Reducing silicon (Si) wafer thickness in the photovoltaic industry has always been demanded for lowering the overall cost. Further benefits such as short collection lengths and improved open circuit voltages can also be achieved by Si thickness reduction. However, the problem with thin films is poor light absorption. One way to decrease optical losses in photovoltaic devices is to minimize the front side reflection. This approach can be applied to front contacted ultra-thin crystalline Si solar cells to increase the light absorption...
October 6, 2017: Nanotechnology
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
Gaoyang Gou, Nenian Charles, Jing Shi, James M Rondinelli
The double perovskite CaMnTi2O6, is a rare A-site ordered perovskite oxide that exhibits a sizable ferroelectric polarization and relatively high Curie temperature. Using first-principles calculations combined with detailed symmetry analyses, we identify the origin of the ferroelectricity in CaMnTi2O6. We further explore the material properties of CaMnTi2O6, including its ferroelectric polarization, dielectric and piezoelectric responses, magnetic order, electronic structure, and optical absorption coefficient...
September 11, 2017: Inorganic Chemistry
Qin Wang, Chu-Chen Chueh, Ting Zhao, Morteza Eslamian, Wallace C H Choy, Alex K-Y Jen
Entirely low-temperature solution-processed (≤ 100 °C) planar p-i-n perovskite solar cells (PVSCs) offer great potential for commercialization of roll-to-roll fabricated photovoltaic devices. However, the stable inorganic hole transporting layer (HTL) in PVSCs is usually processed at high temperature (200 °C ~500 °C) which is far beyond the tolerant temperature (≤ 150 °C) of roll-to-roll fabrication. In this context, inorganic NiOx -nanoparticles (NPs) are an excellent candidate to serve as the HTL in PVSCs, owing to their excellent solution-processability at room temperature...
September 7, 2017: ChemSusChem
Aravind Kumar Chandiran, Shaik M Zakeeruddin, Robin Humphry-Baker, Mohammad Khaja Nazeeruddin, Michael Grätzel, Frédéric Sauvage
The influence of interface modification of sensitized TiO2 surfaces by co-adsorbents on photovoltaic performance is detailed. We investigated different functional groups of co-adsorbents, such as carboxylic (4-guanidino butyric acid, chenodeoxycholic acid), phosphinic (dineohexyl phosphinic acid), and phosphonic (dodecyl phosphonic acid), to better highlight their influence on the device performance and accurately classify them into de-aggregating agents or agents with both de-aggregating and co-adsorbing properties...
September 7, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
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 at the allyl double bond including reaction with HBr in acetic acid, HBr in THF and molecular bromine in dichloromethane...
September 7, 2017: ACS Applied Materials & Interfaces
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