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https://www.readbyqxmd.com/read/27906382/laser-patterned-functionalized-cvd-graphene-as-highly-transparent-conductive-electrodes-for-polymer-solar-cells
#1
Luca La Notte, Enrica Villari, Alessandro Lorenzo Palma, Alberto Sacchetti, Maria Michela Giangregorio, Giovanni Bruno, Aldo Di Carlo, Giuseppe Valerio Bianco, Andrea Reale
A five-layer (5L) graphene on a glass substrate has been demonstrated as a transparent conductive electrode to replace indium tin oxide (ITO) in organic photovoltaic devices. The required low sheet resistance, while maintaining high transparency, and the need of a wettable surface are the main issues. To overcome these, two strategies have been applied: (i) the p-doping of the multilayer graphene, thus reaching 25 Ω □(-1) or (ii) the O2-plasma oxidation of the last layer of the 5L graphene that results in a contact angle of 58° and a sheet resistance of 134 Ω □(-1)...
December 1, 2016: Nanoscale
https://www.readbyqxmd.com/read/27905397/11-4-efficiency-non-fullerene-polymer-solar-cells-with-trialkylsilyl-substituted-2d-conjugated-polymer-as-donor
#2
Haijun Bin, Liang Gao, Zhi-Guo Zhang, Yankang Yang, Yindong Zhang, Chunfeng Zhang, Shanshan Chen, Lingwei Xue, Changduk Yang, Min Xiao, Yongfang Li
Simutaneously high open circuit voltage and high short circuit current density is a big challenge for achieving high efficiency polymer solar cells due to the excitonic nature of organic semdonductors. Herein, we developed a trialkylsilyl substituted 2D-conjugated polymer with the highest occupied molecular orbital level down-shifted by Si-C bond interaction. The polymer solar cells obtained by pairing this polymer with a non-fullerene acceptor demonstrated a high power conversion efficiency of 11.41% with both high open circuit voltage of 0...
December 1, 2016: Nature Communications
https://www.readbyqxmd.com/read/27905394/uvr2-ensures-transgenerational-genome-stability-under-simulated-natural-uv-b-in-arabidopsis-thaliana
#3
Eva-Maria Willing, Thomas Piofczyk, Andreas Albert, J Barbro Winkler, Korbinian Schneeberger, Ales Pecinka
Ground levels of solar UV-B radiation induce DNA damage. Sessile phototrophic organisms such as vascular plants are recurrently exposed to sunlight and require UV-B photoreception, flavonols shielding, direct reversal of pyrimidine dimers and nucleotide excision repair for resistance against UV-B radiation. However, the frequency of UV-B-induced mutations is unknown in plants. Here we quantify the amount and types of mutations in the offspring of Arabidopsis thaliana wild-type and UV-B-hypersensitive mutants exposed to simulated natural UV-B over their entire life cycle...
December 1, 2016: Nature Communications
https://www.readbyqxmd.com/read/27905138/efficient-and-air-stable-mixed-cation-lead-mixed-halide-perovskite-solar-cells-with-n-doped-organic-electron-extraction-layers
#4
Zhiping Wang, David P McMeekin, Nobuya Sakai, Stephan van Reenen, Konrad Wojciechowski, Jay B Patel, Michael B Johnston, Henry J Snaith
Air-stable doping of the n-type fullerene layer in an n-i-p planar heterojunction perovskite device is capable of enhancing device efficiency and improving device stability. Employing a (HC(NH2 )2 )0.83 Cs0.17 Pb(I0.6 Br0.4 )3 perovskite as the photoactive layer, glass-glass laminated devices are reported, which sustain 80% of their "post burn-in" efficiency over 3400 h under full sun illumination in ambient conditions.
December 1, 2016: Advanced Materials
https://www.readbyqxmd.com/read/27905094/improved-work-function-of-poly-3-4-ethylenedioxythiophene-poly-styrenesulfonic-acid-and-its-effect-on-hybrid-silicon-organic-heterojunction-solar-cells
#5
Xiaojuan Shen, Ling Chen, Jianmei Pan, Yue Hu, Songjun Li, Jie Zhao
Hybrid silicon/organic solar cells have been recently extensively investigated due to their simple structure and low-cost fabrication process. However, the efficiency of the solar cells is greatly limited by the barrier height as well as the carrier recombination at the silicon/organic interface. In this work, hydrochloroplatinic acid (H2PtCl6) is employed into the poly(3,4-ethlenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) solution, and the work function (WF) of the PEDOT:PSS layer has been successfully improved...
December 2016: Nanoscale Research Letters
https://www.readbyqxmd.com/read/27902941/enhanced-thermal-stability-of-a-polymer-solar-cell-blend-induced-by-electron-beam-irradiation-in-the-transmission-electron-microscope
#6
Olof Bäcke, Camilla Lindqvist, Amaia Diaz de Zerio Mendaza, Stefan Gustafsson, Ergang Wang, Mats R Andersson, Christian Müller, Per Magnus Kristiansen, Eva Olsson
We show by in situ microscopy that the effects of electron beam irradiation during transmission electron microscopy can be used to lock microstructural features and enhance the structural thermal stability of a nanostructured polymer:fullerene blend. Polymer:fullerene bulk-heterojunction thin films show great promise for use as active layers in organic solar cells but their low thermal stability is a hindrance. Lack of thermal stability complicates manufacturing and influences the lifetime of devices. To investigate how electron irradiation affects the thermal stability of polymer:fullerene films, a model bulk-heterojunction film based on a thiophene-quinoxaline copolymer and a fullerene derivative was heat-treated in-situ in a transmission electron microscope...
November 21, 2016: Ultramicroscopy
https://www.readbyqxmd.com/read/27901151/improving-the-charge-carrier-transport-of-organic-solar-cells-by-incorporating-a-deep-energy-level-molecule
#7
Chunyu Liu, Zhiqi Li, Zhihui Zhang, Xinyuan Zhang, Liang Shen, Wenbin Guo, Liu Zhang, Yongbing Long, Shengping Ruan
Tetrafluoro-tetracyanoquinodimethane (F4-TCNQ), a strong molecular acceptor, has been proved to be an excellent candidate to achieve the p-type doping effect. When F4-TCNQ is incorporated into a poly(3-hexylthiophene) (P3HT): indene-C60 bisadduct (ICBA) active layer, superior behavior upon inducing polymer donor excited electron transport is demonstrated due to the addition of a deep-lying lowest unoccupied molecular orbital (LUMO) from F4-TCNQ, leading to the realization of organic solar cells (OSCs) with an improved power conversion efficiency (PCE) of 5...
November 30, 2016: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/27897390/bis-phenothiazyl-ethynylene-based-organic-dyes-containing-dianchoring-groups-with-efficiency-comparable-to-n719-for-dye-sensitized-solar-cells
#8
Chi-Ho Siu, Lawrence Tien Lin Lee, Po-Yu Ho, Cheuk-Lam Ho, Tao Chen, Songwut Suramitr, Supa Hannongbua, Zhiyuan Xie, Mingdeng Wei, Wai-Yeung Wong
A new series of acetylene-bridged phenothiazine-based dianchoring dyes have been synthesized and fully characterized, and used as the photoactive layer for the fabrication of conventional dye-sensitized solar cells (DSSCs). Tuning of their photophysical and electrochemical properties using different π-conjugated aromatic rings as the central bridge has been demonstrated. This molecular design strategy successfully inhibits the undesirable charge recombination and prolongs the electron lifetime significantly to improve the power conversion efficiency (η), which were proven by the detailed studies of electrochemical impedance spectroscopy (EIS) and open-circuit voltage decay (OCVD)...
November 29, 2016: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/27896346/visible-light-driven-mesoporous-ag-embedded-zno-nanocomposites-reactive-oxygen-species-enhanced-photocatalysis-bacterial-inhibition-and-photodynamic-therapy
#9
Jagriti Gupta, Jeotikanta Mohapatra, D Bahadur
We present here the multitasking capabilities of Ag-embedded ZnO nanocomposites (Ag-ZnO NCs), which include the photocatalytic degradation of organic dyes, bacterial inhibition, and cancer therapeutics. Ag-embedded ZnO nanocomposites (Ag-ZnO NCs) of mesoporous spherical morphology (size ∼ 150 ± 50 nm) are successfully synthesized by a facile and single step soft-chemical approach. To understand the effect of Ag loading on multitasking properties, Ag-ZnO NCs are synthesized with different wt% of Ag. It was found that Ag5-ZnO NCs (5 wt% of Ag) showed excellent solar light-induced photocatalytic degradation properties against both cationic as well as anionic dyes...
November 29, 2016: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/27893177/efficient-charge-transfer-and-fine-tuned-energy-level-alignment-in-a-thf-processed-fullerene-free-organic-solar-cell-with-11-3-efficiency
#10
Zhong Zheng, Omar M Awartani, Bhoj Gautam, Delong Liu, Yunpeng Qin, Wanning Li, Alexander Bataller, Kenan Gundogdu, Harald Ade, Jianhui Hou
Fullerene-free organic solar cells show over 11% power conversion efficiency, processed by low toxic solvents. The applied donor and acceptor in the bulk heterojunction exhibit almost the same highest occupied molecular orbital level, yet exhibit very efficient charge creation.
November 28, 2016: Advanced Materials
https://www.readbyqxmd.com/read/27892638/a-new-nonfullerene-electron-acceptor-with-a-ladder-type-backbone-for-high-performance-organic-solar-cells
#11
Nailiang Qiu, Huijing Zhang, Xiangjian Wan, Chenxi Li, Xin Ke, Huanran Feng, Bin Kan, Hongtao Zhang, Qiang Zhang, Yan Lu, Yongsheng Chen
Nonfullerene acceptor FDICTF (2,9-bis(2methylene-(3-(1,1-dicyanomethylene)indanone))-7,​12-​dihydro-​4,​4,​7,​7,​12,​12-​hexaoctyl-​4H-​cyclopenta[2″,​1″:5,​6;3″,​4″:5',​6']​diindeno[1,​2-​b:1',​2'-​b']dithiophene) modified by fusing the fluorene core in a precursor, yields 10.06% high power conversion efficiency, and demonstrates that the ladder and fused core backbone in A-D-A structure molecules is an effective design strategy for high-performance nonfullerene acceptors...
November 28, 2016: Advanced Materials
https://www.readbyqxmd.com/read/27891742/stability-of-perovskite-solar-cells-a-prospective-on-the-substitution-of-the-a%C3%A2-cation-and-x%C3%A2-anion
#12
REVIEW
Ze Wang, Zejiao Shi, Taotao Li, Yonghua Chen, Wei Huang
In recent years, organometal trihalide perovskites have emerged as promising materials for low-cost, flexible, and highly efficient solar cells. Despite their processing advantages, before the technology can be commercialized the poor stability of the organic-inorganic hybrid perovskite materials with regard to humidity, heat, light, and oxygen has be to overcome. Herein, we distill the current state-of-the-art and highlight recent advances in improving the chemical stability of perovskite materials by substitution of the A-cation and X-anion...
November 28, 2016: Angewandte Chemie
https://www.readbyqxmd.com/read/27891720/the-role-of-the-axial-substituent-in-subphthalocyanine-acceptors-for-bulk-heterojunction-solar-cells
#13
Chunhui Duan, Germán Zango, Miguel García Iglesias, Fallon J M Colberts, Martijn M Wienk, M Victoria Martínez-Díaz, René A J Janssen, Tomás Torres
Four hexachlorosubphthalocyanines SubPcCl6 -X bearing different axial substituents (X) have been synthesized for use as novel electron acceptors in solution-processed bulk-heterojunction organic solar cells. Subphthalocyanines are aromatic chromophoric molecules with cone-shaped structure, good solution processability, intense optical absorption in the visible spectral region, appropriate electron mobilities, and tunable energy levels. Solar cells with subphthalocyanines as the electron acceptor and PTB7-Th as the electron donor exhibit a power conversion efficiency up to 4 % and an external quantum efficiency approaching 60 % due to significant contributions from both the electron donor and the electron acceptor to the photocurrent, indicating a promising prospect of non-fullerene acceptors based on subphthalocyanines and structurally related systems...
November 28, 2016: Angewandte Chemie
https://www.readbyqxmd.com/read/27885716/organic-planar-heterojunctions-from-models-for-interfaces-in-bulk-heterojunctions-to-high-performance-solar-cells
#14
Kyohei Nakano, Keisuke Tajima
Recent progress regarding planar heterojunctions (PHJs) is reviewed, with respect to the fundamental understanding of the photophysical processes at the donor/acceptor interfaces in organic photovoltaic devices (OPVs). The current state of OPV research is summarized and the advantages of PHJs as models for exploring the relationship between organic interfaces and device characteristics described. The preparation methods and the characterization of PHJ structures to provide key points for the appropriate handling of PHJs...
November 25, 2016: Advanced Materials
https://www.readbyqxmd.com/read/27883127/enhanced-perovskite-morphology-and-crystallinity-for-high-performance-perovskite-solar-cells-using-a-porous-hole-transport-layer-from-polystyrene-nanospheres
#15
Fan Zhang, Jun Song, Ming Chen, Junchen Liu, Yuying Hao, Yuncai Wang, Junle Qu, Pengju Zeng
: Organic-inorganic metal halide perovskites have led to remarkable advancements in emerging photovoltaics. The rapid increase in the power conversion efficiency (PCE) of PSCs has been mainly achieved by improving perovskite morphology and crystallinity. Herein, we report a simple and effective means to improve perovskite grain sizes using a porous hole transport layer (i.e. , PEDOT: PSS in this work). We used polystyrene nanospheres as a sacrificial template to fabricate the porous-PEDOT:PSS...
November 24, 2016: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/27882976/doped-polymer-semiconductors-with-ultrahigh-and-ultralow-work-functions-for-ohmic-contacts
#16
Cindy G Tang, Mervin C Y Ang, Kim-Kian Choo, Venu Keerthi, Jun-Kai Tan, Mazlan Nur Syafiqah, Thomas Kugler, Jeremy H Burroughes, Rui-Qi Png, Lay-Lay Chua, Peter K H Ho
To make high-performance semiconductor devices, a good ohmic contact between the electrode and the semiconductor layer is required to inject the maximum current density across the contact. Achieving ohmic contacts requires electrodes with high and low work functions to inject holes and electrons respectively, where the work function is the minimum energy required to remove an electron from the Fermi level of the electrode to the vacuum level. However, it is challenging to produce electrically conducting films with sufficiently high or low work functions, especially for solution-processed semiconductor devices...
November 23, 2016: Nature
https://www.readbyqxmd.com/read/27871725/organic-and-perovskite-solar-cells-working-principles-materials-and-interfaces
#17
REVIEW
Nevena Marinova, Silvia Valero, Juan Luis Delgado
In the last decades organic solar cells (OSCs) have been considered as a promising photovoltaic technology with the potential to provide reasonable power conversion efficiencies combined with low cost and easy processability. Unexpectedly, Perovskite Solar Cells (PSCs) have experienced unprecedented rise in Power Conversion Efficiency (PCE) thus emerging as a highly efficient photovoltaic technology. OSCs and PSCs are two different kind of devices with distinct charge generation mechanism, which however share some similarities in the materials processing, thus standard strategies developed for OSCs are currently being employed in PSCs...
November 11, 2016: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/27870983/modulation-of-%C3%AF-spacer-of-carbazole-carbazole-based-organic-dyes-toward-high-efficient-dye-sensitized-solar-cells
#18
Chirawat Chitpakdee, Siriporn Jungsuttiwong, Taweesak Sudyoadsuk, Vinich Promarak, Nawee Kungwan, Supawadee Namuangruk
The effects of type and position of π-linker in carbazole-carbazole based dyes on their performance in dye-sensitized solar cells (DSSCs) were investigated by DFT and TDDFT methods. The calculated electronic energy level, electron density composition, charge injection and charge recombination properties were compared with those of the high performance CCT3A dye synthesized recently. It is found that that mixing a benzothiadizole (B) unit with two thiophene (T) units in the π-spacer can greatly shift absorption wavelength to near infrared region and enhance the light harvesting efficiency (LHE) resulting in increasing of short-circuit current density (Jsc), whereas a thienothiophene unit does not affect those properties...
November 12, 2016: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/27870244/visualization-based-data-mining-for-comparison-between-two-solar-cell-libraries
#19
Abraham Yosipof, Omer Kaspi, Koushik Majhi, Hanoch Senderowitz
Material informatics may provide meaningful insights and powerful predictions for the development of new and efficient Metal Oxide (MO) based solar cells. The main objective of this paper is to establish the usefulness of data reduction and visualization methods for analyzing data sets emerging from multiple all-MOs solar cell libraries. For this purpose, two libraries, TiO2 |Co3 O4 and TiO2 |Co3 O4 |MoO3 , differing only by the presence of a MoO3 layer in the latter were analyzed with Principal Component Analysis and Self-Organizing Maps...
December 2016: Molecular Informatics
https://www.readbyqxmd.com/read/27869824/reducing-the-efficiency-stability-cost-gap-of-organic-photovoltaics-with-highly-efficient-and-stable-small-molecule-acceptor-ternary-solar-cells
#20
Derya Baran, Raja Shahid Ashraf, David A Hanifi, Maged Abdelsamie, Nicola Gasparini, Jason A Röhr, Sarah Holliday, Andrew Wadsworth, Sarah Lockett, Marios Neophytou, Christopher J M Emmott, Jenny Nelson, Christoph J Brabec, Aram Amassian, Alberto Salleo, Thomas Kirchartz, James R Durrant, Iain McCulloch
Technological deployment of organic photovoltaic modules requires improvements in device light-conversion efficiency and stability while keeping material costs low. Here we demonstrate highly efficient and stable solar cells using a ternary approach, wherein two non-fullerene acceptors are combined with both a scalable and affordable donor polymer, poly(3-hexylthiophene) (P3HT), and a high-efficiency, low-bandgap polymer in a single-layer bulk-heterojunction device. The addition of a strongly absorbing small molecule acceptor into a P3HT-based non-fullerene blend increases the device efficiency up to 7...
November 21, 2016: Nature Materials
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