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https://www.readbyqxmd.com/read/28531350/embedded-metal-electrode-for-organic-inorganic-hybrid-nanowire-solar-cells
#1
Han-Don Um, Deokjae Choi, Ahreum Choi, Ji Hoon Seo, Kwanyong Seo
We demonstrate here an embedded metal electrode for highly efficient organic-inorganic hybrid nanowire solar cells. The electrode proposed here is an effective alternative to the conventional bus and finger electrode which leads to a localized short circuit at a direct Si/metal contact and has a poor collection efficiency due to a nonoptimized electrode design. In our design, an Ag/SiO2 electrode is embedded into a Si substrate while being positioned between Si nanowire (SiNW) arrays underneath poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS), facilitating suppressed recombination at the Si/Ag interface and notable improvements in the fabrication reproducibility...
May 22, 2017: ACS Nano
https://www.readbyqxmd.com/read/28530404/role-of-crystallization-in-the-morphology-of-polymer-non-fullerene-acceptor-bulk-heterojunctions
#2
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
#3
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/28524245/towards-efficient-spectral-converters-through-materials-design-for-luminescent-solar-devices
#4
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/28517241/dopant-free-hole-transport-materials-based-on-methoxytriphenylamine-substituted-indacenodithienothiophene-for-solution-processed-perovskite-solar-cells
#5
Xiaoyuan Liu, Xiaolu Zheng, Yulong Wang, Zhiliang Chen, Fang Yao, Qi Zhang, Guojia Fang, Zhi-Kuan Chen, Wei Huang, ZongXiang Xu
Solution-processed hole transporting materials (HTMs) that are dopant-free show promise for use in low-cost, high performance perovskite solar cells (PSCs). The highest efficiency PSCs use organic HTMs, many of which have low mobilities and so require doping, which lowers the device stability. Additionally, these materials are not easily scaled because they often require complicated synthesis. Two novel HTMs (IDT-TPA and IDTT-TPA) were synthesized, which contained either an extended fused-ring indacenodithiophene (IDT) or indacenodithienothiophene (IDTT) core and strong electron donating methoxytriphenylamine (TPA) groups as the end-capping units...
May 18, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28516516/towards-long-term-stable-and-efficient-large-area-organic-solar-cells
#6
Pei-Ting Tsai, Kuan-Chu Lin, Cheng-Yu Wu, Chung-Hung Liao, Man-Chun Lin, Ying Qian Wong, Hsin-Fei Meng, Chih-Yu Chang, Chien-Lung Wang, Yi-Fan Huang, Sheng-Fu Horng, Hsiao-Wen Zan, Yu-Chiang Chao
In this study, we report that long-term stable and efficient organic solar cells (OSCs) can be obtained via the following strategies: (1) combination of rapid-drying blade-coating deposition with an appropriate thermal annealing treatment to obtain an optimized morphology of the active layer; (2) insertion of interfacial layers to optimize the interfacial properties. The resulting devices based on poly[4,8-bis(5-(2-ethylhexyl)thiophen-2-yl)benzo[1,2-b;4,5-b']dithiophene-2,6-diyl-alt-(4-(2-ethylhexyl)-3-fluorothieno[3,4-b]thiophene-)-2-carboxylate-2-6-diyl)] (PBDTTT-EFT):[6,6]-phenyl C71 butyric acid methyl ester (PC71BM) blend as the active layer exhibits a power conversion efficiency (PCE) up to 9...
May 17, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28513158/molecular-optimization-enables-over-13-efficiency-in-organic-solar-cells
#7
Wenchao Zhao, Sunsun Li, Huifeng Yao, Shaoqing Zhang, Yun Zhang, Bei Yang, Jianhui Hou
A new polymer donor (PBDB-T-SF) and a new small molecule acceptor (IT-4F) for fullerene-free organic solar cells (OSCs) were designed and synthesized. The influences of fluorination on the absorption spectra, molecular energy levels, and charge mobilities of the donor and acceptor were systematically studied. The PBDB-T-SF:IT-4F-based OSC device showed a record high efficiency of 13.1%, and an efficiency of over 12% can be obtained with a thickness of 100-200 nm, suggesting the promise of fullerene-free OSCs in practical applications...
May 22, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28512333/hybrid-organic-tandem-solar-cell-comprising-small-molecule-bottom-and-polymer-fullerene-top-subcells-fabricated-by-thin-film-transfer
#8
Yoonseok Ka, Hyejin Hwang, Changsoon Kim
Multilayer structures involving solution-deposited polymer films are difficult to fabricate, not allowing for unrestricted designs of polymer-based optoelectronic devices required for maximizing their performance. Here, we fabricate a hybrid organic tandem solar cell whose top and bottom subcells have polymer:fullerene and small molecules active layers, respectively, by a solvent-free process based on transferring the polymer:fullerene layer from an elastomeric stamp onto a vacuum-deposited bottom subcell. The interface between small-molecule and transferred polymer:fullerene layers is void-free at the nanoscale, allowing for efficient charge transport across the interface...
May 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28508629/inorganic-ligand-thiosulfate-capped-quantum-dots-for-efficient-quantum-dot-sensitized-solar-cells
#9
Zhenwei Ren, Juan Yu, Zhenxiao Pan, Jizheng Wang, Xinhua Zhong
The insulating nature of organic ligands containing long hydrocarbon tail brings forward serious limitations for pre-synthesized 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 to improve the performance of the resulting solar cells. Herein, thiosulfate (S2O32-), and sulfide (S2-) were employed as ligand exchange reagents to get access to the inorganic ligand S2O32-, and S2- capped CdSe QDs...
May 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28508587/organic-inorganic-hybrid-perovskite-with-controlled-dopant-modification-and-application-in-photovoltaic-device
#10
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
#11
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/28505416/a-high-temperature-short-time-annealing-process-for-high-performance-large-area-perovskite-solar-cells
#12
Minjin Kim, Gi-Hwan Kim, Kyoung Suk Oh, Yimhyun Jo, Hyun Yoon, Ka-Hyun Kim, Heon Lee, Jin Young Kim, Dong Suk Kim
Organic-inorganic hybrid metal halide perovskite solar cells (PSCs) are attracting tremendous research interest due to their high solar-to-electric power conversion efficiency with a high possibility of cost-effective fabrication and certified power conversion efficiency now exceeding 22%. Although many effective methods for their application have been developed over the last decade, their practical transition to large-size devices have been restricted by difficulties in achieving high performance. Here we report on the development of a simple and cost-effective production method with high-temperature and short-time annealing processing to obtain uniform, smooth, and large-size grain domains of perovskite films over large areas...
May 15, 2017: ACS Nano
https://www.readbyqxmd.com/read/28504512/fully-printable-organic-and-perovskite-solar-cells-with-transfer-printed-flexible-electrodes
#13
Xianqiang Li, Xiaohong Tang, Tao Ye, Dan Wu, Hong Wang, Xizu Wang
The perovskite solar cells (PSCs) and organic solar cells (OSCs) with high performance were fabricated with transfer-printed top metal electrodes. We have demonstrated that PSCs and OSCs with the top Au electrodes fabricated by using the transfer printing method have comparable or better performance than the devices with the top Au electrodes fabricated by using the conventional thermal evaporation method. The highest PCE of the PSCs and OSCs with the top electrodes fabricated using the transfer printing method achieved 13...
May 22, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28501643/efficient-wastewater-treatment-and-simultaneously-electricity-production-using-a-photocatalytic-fuel-cell-based-on-the-radical-chain-reactions-initiated-by-dual-photoelectrodes
#14
Kai Zhao, Jing Bai, Qingyi Zeng, Yan Zhang, Jinhua Li, Linsen Li, Ligang Xia, Baoxue Zhou
Efficient conversion of wastewater into clean energy was achieved by applying a radical chain reaction strategy in a solar responsive photocatalytic fuel cell (PFC) system. The system was constructed with two photoelectrodes where ferrous ions were added to enhance the radical reactions for organic pollutants degradation from the surface of electrodes to the whole solution system via coming into a continuous radical chain reaction. The results indicated that the short-circuit current (Jsc) and the power density (JVmax) obtained in the PFC system is up to 1...
May 4, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28497974/carbon-nanotube-and-semiconductor-nanorods-hybrids-preparation-characterization-and-evaluation-of-photocurrent-generation
#15
Jugun Prakash Chinta, Nir Waiskopf, Gur Lubin, David Rand, Yael Hanein, Uri Banin, Shlomo Yitzchaik
Carbon nanotubes (CNTs) and semiconductor nanocrystals (SCNCs) are known to be interesting donor-acceptor partners due to their unique optical and electronic properties. These exciting features have led to the development of novel composites based on these two nanomaterials and to their characterization for use in various applications, such as components in sensors, transistors, solar cells and biomedical devices. Two approaches based on covalent and non-covalent methods have been suggested for coupling the SCNCs to CNTs...
May 12, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28497947/energy-transfer-kinetics-in-photosynthesis-as-an-inspiration-for-improving-organic-solar-cells
#16
Collins Nganou, Gerhard Lackner, Bezu Teschome, M Jamal Deen, Noam Adir, David Pouhe, Doru C Lupascu, Martin Mkandawire
Clues to designing highly efficient organic solar cells may lie in understanding the architecture of light-harvesting systems and exciton energy transfer (EET) processes in very efficient photosynthetic organisms. Here, we compare the kinetics of excitation energy tunnelling from the intact phycobilisome (PBS) light-harvesting antenna system to the reaction center in photosystem II in intact cells of the cyanobacterium Acaryochloris marina with the charge transfer after conversion of photons into photocurrent in vertically aligned carbon nanotube (va-CNT) organic solar cells with poly(3-hexyl)thiophene (P3HT) as the pigment...
May 22, 2017: ACS Applied Materials & Interfaces
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
#17
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/28496134/inkjet-printing-of-nio-films-and-integration-as-hole-transporting-layers-in-polymer-solar-cells
#18
Arjun Singh, Shailendra Kumar Gupta, Ashish Garg
Stability concerns of organic solar cell devices have led to the development of alternative hole transporting layers such as NiO which lead to superior device life times over conventional Poly(3,4-ethylenedioxythiophene) Polystyrene sulfonate (PEDOT:PSS) buffered solar cells. From the printability of such devices, it is imperative to be able to print NiO layers in the organic solar cell devices with normal architecture which has so far remained unreported. In this manuscript, we report on the successful ink-jet printing of very thin NiO thin films with controlled thickness and morphology and their integration in organic solar cell devices...
May 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28489333/highly-efficient-and-uniform-1-cm%C3%A2-perovskite-solar-cells-with-an-electrochemically-deposited-niox-hole-extraction-layer
#19
Ik Jae Park, Gyeongho Kang, Min Ah Park, Ju Seong Kim, Se Won Seo, Dong Hoe Kim, Kai Zhu, Taiho Park, Jin Young Kim
Given that the highest certified conversion efficiency of the organic-inorganic perovskite solar cell (PSC) is already over 22%, which is even higher than that of the polycrystalline silicon solar cell, the significance of new scalable processes that can be utilized for preparing large-area devices and their commercialization is rapidly increasing. From this perspective, the electrodeposition method is one of the mostly suitable processes for preparing large-area devices, because it is an already commercialized process with proven controllability and scalability...
May 10, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28488763/recent-progress-in-the-design-of-advanced-cathode-materials-and-battery-models-for-high-performance-lithium-x-x-o2-s-se-te-i2-br2-batteries
#20
REVIEW
Jiantie Xu, Jianmin Ma, Qinghua Fan, Shaojun Guo, Shixue Dou
Recent advances and achievements in emerging Li-X (X = O2 , S, Se, Te, I2 , Br2 ) batteries with promising cathode materials open up new opportunities for the development of high-performance lithium-ion battery alternatives. In this review, we focus on an overview of recent important progress in the design of advanced cathode materials and battery models for developing high-performance Li-X (X = O2 , S, Se, Te, I2 , Br2 ) batteries. We start with a brief introduction to explain why Li-X batteries are important for future renewable energy devices...
May 10, 2017: Advanced Materials
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