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https://www.readbyqxmd.com/read/28535603/realizing-full-coverage-of-stable-perovskite-film-by-modified-anti-solvent-process
#1
Long Ji, Ting Zhang, Yafei Wang, Peng Zhang, Detao Liu, Zhi Chen, Shibin Li
Lead-free solution-processed solid-state photovoltaic devices based on formamidinium tin triiodide (FASnI3) and cesium tin triiodide (CsSnI3) perovskite semiconductor as the light harvester are reported. In this letter, we used solvent engineering and anti-solvent dripping method to fabricate perovskite films. SnCl2 was used as an inhibitor of Sn(4+) in FASnI3 precursor solution. We obtained the best films under the function of toluene or chlorobenzene in anti-solvent dripping method and monitored the oxidation of FASnI3 films in air...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28534675/gallium-in-depth-profile-in-bromine-etched-copper-indium-galium-di-selenide-cigs-thin-films-inspected-using-raman-spectroscopy
#2
Jacopo Parravicini, Maurizio Acciarri, Alberto Lomuscio, Matteo Murabito, Alessia Le Donne, Andrea Gasparotto, Simona Binetti
In the thin film solar cells domain, copper indium galium (di)selenide (CIGS) is a material with well-established photovoltaic purpose. Here the presence of a suitable [Ga]/([Ga]+[In]) (GGI) in-depth profile has proved to play a key role in the performance of cells. The implementation of a routine method based on reliable but easily available experimental techniques is mandatory to obtain information on the GGI profile of any CIGS layer, in order to achieve high efficiency chalcogenide layers. In this vein, we here propose and systematically test a simple method for the GGI profile determination based on repeated bromine etching of CIGS thin films followed by Raman analysis of the A1 peak position...
June 2017: Applied Spectroscopy
https://www.readbyqxmd.com/read/28530404/role-of-crystallization-in-the-morphology-of-polymer-non-fullerene-acceptor-bulk-heterojunctions
#3
Kathryn A O'Hara, David P Ostrowski, Unsal Koldemir, Christopher J Takacs, Sean E Shaheen, Alan Sellinger, Michael L Chabinyc
Many high efficiency organic photovoltaics use fullerene-based acceptors despite their high production cost, weak optical absorption in the visible range, and limited synthetic variability of electronic and optical properties. To circumvent this deficiency, non-fullerene small-molecule acceptors have been developed that have good synthetic flexibility, allowing for precise tuning of optoelectronic properties, leading to enhanced absorption of the solar spectrum and increased open-circuit voltages (VOC). We examined the detailed morphology of bulk heterojunctions of poly(3-hexylthiophene) and the small-molecule acceptor HPI-BT to reveal structural changes that lead to improvements in the fill factor of solar cells upon thermal annealing...
May 22, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28530392/a-hexafluoroquinoxaline-based-polymer-for-nonfullerene-solar-cells-reaching-9-4-efficiency
#4
Shutao Xu, Liuliu Feng, Jun Yuan, Zhi-Guo Zhang, Yongfang Li, Hongjian Peng, Yingping Zou
hrough introducing six fluorine atoms onto quinoxaline (Qx), a new electron acceptor unit-hexafluoroquinoxaline (HFQx) is firstly synthesized. Based on this unit, we synthesize a new donor-acceptor (D-A) copolymer (HFQx-T), which is composed of benzodithiophene (BDT) derivative donor block and an HFQx accepting block. The strong electron-withdrawing properties of fluorine atoms increase significantly the voltage open-circuit (Voc) by tuning the highest occupied molecular orbital (HOMO) energy level. In addition, fluorine atoms enhance the absorption coefficient of the conjugated copolymer and change the film morphology, which implies an increase of the short-circuit current density (Jsc) and fill factor (FF)...
May 22, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28525677/nonlinear-optical-properties-of-sodium-copper-chlorophyllin-in-aqueous-solution
#5
Jiangting Li, Yufeng Peng, Xueyun Han, Shaoshuai Guo, Kunning Liang, Minggao Zhang
BACKGROUND: Sodium copper chlorophyllin (SCC), as one of the derivatives of chlorophyll - with its inherent green features; good stability for heat, light, acids and alkalies; unique antimicrobial capability; and particular deodori zation performance - is widely applied in some fields such as the food industry, medicine and health care, daily cosmetic industry etc. SCC, as one of the metal porphyrins, has attracted much attention because of its unique electronic band structure and photon conversion performance...
May 19, 2017: Journal of Applied Biomaterials & Functional Materials
https://www.readbyqxmd.com/read/28524262/thermally-stable-mapbi3-perovskite-solar-cells-with-efficiency-of-19-19-and-area-over-1-cm-2-achieved-by-additive-engineering
#6
Yongzhen Wu, Fengxian Xie, Han Chen, Xudong Yang, Huimin Su, Molang Cai, Zhongmin Zhou, Takeshi Noda, Liyuan Han
Solution-processed perovskite (PSC) solar cells have achieved extremely high power conversion efficiencies (PCEs) over 20%, but practical application of this photovoltaic technology requires further advancements on both long-term stability and large-area device demonstration. Here, an additive-engineering strategy is developed to realize a facile and convenient fabrication method of large-area uniform perovskite films composed of large crystal size and low density of defects. The high crystalline quality of the perovskite is found to simultaneously enhance the PCE and the durability of PSCs...
May 19, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28524245/towards-efficient-spectral-converters-through-materials-design-for-luminescent-solar-devices
#7
REVIEW
Barry McKenna, Rachel C Evans
Single-junction photovoltaic devices exhibit a bottleneck in their efficiency due to incomplete or inefficient harvesting of photons in the low- or high-energy regions of the solar spectrum. Spectral converters can be used to convert solar photons into energies that are more effectively captured by the photovoltaic device through a photoluminescence process. Here, recent advances in the fields of luminescent solar concentration, luminescent downshifting, and upconversion are discussed. The focus is specifically on the role that materials science has to play in overcoming barriers in the optical performance in all spectral converters and on their successful integration with both established (e...
May 19, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28520164/transition-metal-chalcogenides-graphene-ensembles-for-light-induced-energy-applications
#8
Antonia Kagkoura, Theodosis Skaltsas, Nikos Tagmatarchis
Recently, nanomaterials that harvest solar energy and convert it to other forms of energy are of great interest. In this context, transition metal chalcogenides (TMCs) are lately on the spotlight due to their optoelectronic properties that render them potential candidates mainly in energy conversion applications. Integration of TMCs onto a strong electron accepting material, such as graphene, yielding novel TMC/graphene ensembles is of high significance, since photoinduced charge-transfer phenomena leading to intra-ensemble charge-separation, may occur...
May 18, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28514169/engineering-interface-structure-to-improve-efficiency-and-stability-of-organometal-halide-perovskite-solar-cells
#9
Longbin Qiu, Luis K Ono, Yan Jiang, Matthew R Leyden, Sonia R Raga, Shenghao Wang, Yabing Qi
The rapid rise of power conversion efficiency (PCE) of low cost organometal halide perovskite solar cells suggests that these cells are a promising alternative to conventional photovoltaic technology. However, anomalous hysteresis and unsatisfactory stability hinder the industrialization of perovskite solar cells. Interface engineering is of importance for the fabrication of highly stable and hysteresis free perovskite solar cells. Here we report that a surface modification of the widely used TiO2 compact layer can give insight into interface interaction in perovskite solar cells...
May 17, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28513716/combining-light-harvesting-with-detachability-in-high-efficiency-thin-film-silicon-solar-cells
#10
Sanjay K Ram, Derese Desta, Rita Rizzoli, Michele Bellettato, Folmer Lyckegaard, Pia B Jensen, Bjarke R Jeppesen, Jacques Chevallier, Caterina Summonte, Arne Nylandsted Larsen, Peter Balling
Efforts to realize thin-film solar cells on unconventional substrates face several obstacles in achieving good energy-conversion efficiency and integrating light-management into the solar cell design. In this report a technique to circumvent these obstacles is presented: transferability and an efficient light-harvesting scheme are combined for thin-film silicon solar cells by the incorporation of a NaCl layer. Amorphous silicon solar cells in p-i-n configuration are fabricated on reusable glass substrates coated with an interlayer of NaCl...
May 17, 2017: Nanoscale
https://www.readbyqxmd.com/read/28508629/inorganic-ligand-thiosulfate-capped-quantum-dots-for-efficient-quantum-dot-sensitized-solar-cells
#11
Zhenwei Ren, Juan Yu, Zhenxiao Pan, Jizheng Wang, Xinhua Zhong
The insulating nature of organic ligands containing long hydrocarbon tails brings forward serious limitations for presynthesized quantum dots (QDs) in photovoltaic applications. Replacing the initial organic hydrocarbon chain ligands with simple, cheap, and small inorganic ligands is regarded as an efficient strategy for improving the performance of the resulting photovoltaic devices. Herein, thiosulfate (S2O3(2-)), and sulfide (S(2-)) were employed as ligand-exchange reagents to get access to the inorganic ligand S2O3(2-)- and S(2-)-capped CdSe QDs...
May 24, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28508587/organic-inorganic-hybrid-perovskite-with-controlled-dopant-modification-and-application-in-photovoltaic-device
#12
Wangen Zhao, Dong Yang, Shengzhong Frank Liu
Organic-inorganic hybrid perovskite as a kind of promising photovoltaic material is booming due to its low-cost, high defect tolerance, and easy fabrication, which result in the huge potential in industrial production. In the pursuit of high efficiency photovoltaic devices, high-quality absorbing layer is essential. Therefore, developing organic-inorganic hybrid perovskite thin films with good coverage, improved uniformity, and crystalline in a single pass deposition is of great concern in realizing good performance of perovskite thin-film solar cell...
May 16, 2017: Small
https://www.readbyqxmd.com/read/28507663/molecular-engineering-and-sequential-cosensitization-for-preventing-the-trade-off-effect-with-photovoltaic-enhancement
#13
Weiwei Zhang, Yongzhen Wu, Xin Li, Erpeng Li, Xiongrong Song, Huiyun Jiang, Chao Shen, Hao Zhang, He Tian, Wei-Hong Zhu
In dye-sensitized solar cells (DSSCs), it is essential to use rational molecular design to obtain promising photosensitizers with well-matched energy levels and narrow optical band gaps. However, the "trade-off" effect between the photocurrent and photovoltage is still a challenge. Here we report four benzoxidazole based D-A-π-A metal-free organic dyes (WS-66, WS-67, WS-68 and WS-69) with different combinations of π-spacer units and anchoring-acceptor groups. Either extending the π-spacer or enhancing the electron acceptor can efficiently modulate the molecular energy levels, leading to a red-shift in the absorption spectra...
March 1, 2017: Chemical Science
https://www.readbyqxmd.com/read/28506678/adaptive-super-twisting-sliding-mode-control-for-a-three-phase-single-stage-grid-connected-differential-boost-inverter-based-photovoltaic-system
#14
Akshaya K Pati, N C Sahoo
This paper presents an adaptive super-twisting sliding mode control (STC) along with double-loop control for voltage tracking performance of three-phase differential boost inverter and DC-link capacitor voltage regulation in grid-connected PV system. The effectiveness of the proposed control strategies are demonstrated under realistic scenarios such as variations in solar insolation, load power demand, grid voltage, and transition from grid-connected to standalone mode etc. Additional supplementary power quality control functions such as harmonic compensation, and reactive power management are also investigated with the proposed control strategy...
May 12, 2017: ISA Transactions
https://www.readbyqxmd.com/read/28498672/photovoltaic-hybrid-perovskites-under-pressure
#15
Marek Szafrański, Andrzej Katrusiak
High-pressure studies on methylammonium trihaloplumbates, of general formula [CH3NH3](+)PbX3(-) (abbreviated MAPbX3, where X = Cl, Br, I), and its analogues shed new light on the materials for harvesting solar energy and open new perspectives for photovoltaic science and technology. However, there are considerable discrepancies between the reported structural, calorimetric, and spectroscopic results and even between the results obtained by the same technique, for example, of X-ray diffraction. The origins of these discrepancies and possible pitfalls in the diffraction and spectroscopic studies on MAPbX3 crystals have been investigated...
May 22, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28497832/a-unique-semiconductor-carbon-metal-hybrid-structure-design-as-a-counter-electrode-in-dye-sensitized-solar-cells
#16
Sheng-Qi Guo, Ling-Chang Wang, Chen-Guang Zhang, Gao-Can Qi, Bing-Chuan Gu, Lu Liu, Zhi-Hao Yuan
The catalytic activity of counter electrodes (CEs) severely restricts the photovoltaic conversion efficiency of dye-sensitized solar cells. However, electrons trapped by bulk defects greatly reduce the catalytic activity of the CE. In this study, we report a novel In2S3-C-Au hybrid structure designed by simply decorating Au particles on the surface of carbon-coated hierarchical In2S3 flower-like architectures, which could avoid the abovementioned problems. This effect can be attributed to the unique contribution of indium sulfide, carbon, and Au from the hybrid structure, as well as to their synergy...
May 12, 2017: Nanoscale
https://www.readbyqxmd.com/read/28497818/new-d-d-%C3%AF-a-triphenylamine-coumarin-sensitizers-for-dye-sensitized-solar-cells
#17
Ji He, Yang Liu, Jianrong Gao, Liang Han
Three D-D-π-A triphenylamine-coumarin sensitizers were designed and synthesized with a triphenylamine and coumarin double donor and a cyanoacrylic acid acceptor. Thiophene, bithiophene and phenylthiophene were used as π-bridges, respectively, and the effects of different π-bridges on the photophysical properties and photovoltaic performance were investigated. With the incorporation of an additional thiophene unit, the bithiophene π-bridge contributes to better light absorption and hence superior JSC compared with the thiophene π-bridge...
May 12, 2017: Photochemical & Photobiological Sciences
https://www.readbyqxmd.com/read/28497691/fine-tuned-photoactive-and-interconnection-layers-for-achieving-over-13-efficiency-in-a-fullerene-free-tandem-organic-solar-cell
#18
Yong Cui, Huifeng Yao, Bowei Gao, Yunpeng Qin, Shaoqing Zhang, Bei Yang, Chang He, Bowei Xu, Jianhui Hou
Fabricating organic solar cells (OSCs) with a tandem structure has been considered an effective method to overcome the limited light absorption spectra of organic photovoltaic materials. Currently, the most efficient tandem OSCs are fabricated by adopting fullerene-derivatives as acceptors. Here, we design a new NF-acceptor with an E(opt)g of 1.68 eV for the front sub-cells and optimize the phase separation morphology of a fullerene-free active layer with an E(opt)g of 1.36 eV to fabricate the rear sub-cell...
May 12, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28497686/enhancing-the-durability-and-carrier-selectivity-of-perovskite-solar-cells-using-a-blend-interlayer
#19
Dong Hun Sin, Sae Byeok Jo, Seung Goo Lee, Hyomin Ko, Min Kim, Hansol Lee, Kilwon Cho
A mechanically and thermally stable and electron-selective ZnO/CH3NH3PbI3 interface is created via hybridization of a polar insulating polymer, poly(ethylene glycol) (PEG), into ZnO nanoparticles (NPs). PEG successfully passivates the oxygen defects on ZnO and prevents direct contact between CH3NH3PbI3 and defects on ZnO. A uniform CH3NH3PbI3 film is formed on a soft ZnO:PEG layer after dispersion of the residual stress from the volume expansion during CH3NH3PbI3 conversion. PEG also increases the work of adhesion of the CH3NH3PbI3 film on the ZnO:PEG layer and holds the CH3NH3PbI3 film with hydrogen bonding...
May 19, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28493673/controlled-crystal-grain-growth-in-mixed-cation-halide-perovskite-by-evaporated-solvent-vapor-recycling-method-for-high-efficiency-solar-cells
#20
Youhei Numata, Atsushi Kogo, Yosuke Udagawa, Hideyuki Kunugita, Kazuhiro Ema, Yoshitaka Sanehira, Tsutomu Miyasaka
We developed a new and simple solvent vapor-assisted thermal annealing (VA) procedure which can reduce grain boundaries in a perovskite film for fabricating highly efficient perovskite solar cells (PSCs). By recycling of solvent molecules evaporated from an as-prepared perovskite film as a VA vapor source, named the pot-roast VA (PR-VA) method, finely controlled and reproducible device fabrication was achieved for formamidinium (FA) and methylammonium (MA) mixed cation-halide perovskite (FAPbI3)0.85(MAPbBr3)0...
May 23, 2017: ACS Applied Materials & Interfaces
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