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https://www.readbyqxmd.com/read/28337916/ag-incorporated-organic-inorganic-perovskite-films-and-planar-heterojunction-solar-cells
#1
Qi Chen, Lei Chen, Fengye Ye, Ting Zhao, Feng Tang, Adharsh Rajagopal, Zheng Jiang, Shenlong Jiang, Alex K-Y Jen, Yi Xie, Jinhua Cai, Liwei Chen
Controlled doping for adjustable material polarity and charge carrier concentration is the basis of semiconductor materials and devices, and it is much more difficult to achieve in ionic semiconductors (e.g. ZnO and GaN) than in covalent semiconductors (e.g. Si and Ge), due to the high intrinsic defect density in ionic semiconductors. The organic-inorganic perovskite material, which is frenetically being researched for applications in solar cells and beyond, is also an ionic semiconductor. Here we present the Ag-incorporated organic-inorganic perovskite films and planar heterojunction solar cells...
March 24, 2017: Nano Letters
https://www.readbyqxmd.com/read/28335208/the-influence-of-fluorination-on-nano-scale-phase-separation-and-photovoltaic-performance-of-small-molecular-pc71bm-blends
#2
Zhen Lu, Wen Liu, Jingjing Li, Tao Fang, Wanning Li, Jicheng Zhang, Feng Feng, Wenhua Li
To investigate the fluorination influence on the photovoltaic performance of small molecular based organic solar cells (OSCs), six small molecules based on 2,1,3-benzothiadiazole (BT), and diketopyrrolopyrrole (DPP) as core and fluorinated phenyl (DFP) and triphenyl amine (TPA) as different terminal units (DFP-BT-DFP, DFP-BT-TPA, TPA-BT-TPA, DFP-DPP-DFP, DFP-DPP-TPA, and TPA-DPP-TPA) were synthesized. With one or two fluorinated phenyl as the end group(s), HOMO level of BT and DPP based small molecular donors were gradually decreased, inducing high open circuit voltage for fluorinated phenyl based OSCs...
April 21, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28332818/in-situ-preparation-of-metal-halide-perovskite-nanocrystal-thin-films-for-improved-light-emitting-devices
#3
Lianfeng Zhao, Yao-Wen Yeh, Nhu L Tran, Fan Wu, Zhengguo Xiao, Ross A Kerner, YunHui L Lin, Gregory D Scholes, Nan Yao, Barry P Rand
Hybrid organic-inorganic halide perovskite semiconductors are attractive candidates for optoelectronic applications, such as photovoltaics, light-emitting diodes, and lasers. Perovskite nanocrystals are of particular interest, where electrons and holes can be confined spatially, promoting radiative recombination. However, nanocrystalline films based on traditional colloidal nanocrystal synthesis strategies suffer from the use of long insulating ligands, low colloidal nanocrystal concentration, and significant aggregation during film formation...
March 23, 2017: ACS Nano
https://www.readbyqxmd.com/read/28323352/efficient-semitransparent-solar-cells-with-high-nir-responsiveness-enabled-by-a-small-bandgap-electron-acceptor
#4
Feng Liu, Zichun Zhou, Cheng Zhang, Jianyun Zhang, Qin Hu, Thomas Vergote, Feng Liu, Thomas P Russell, Xiaozhang Zhu
Inspired by the remarkable promotion of power conversion efficiency (PCE), commercial applications of organic photovoltaics (OPVs) can be foreseen in near future. One of the most promising applications is semitransparent (ST) solar cells that can be utilized in value-added applications such as energy-harvesting windows. However, the single-junction STOPVs utilizing fullerene acceptors show relatively low PCEs of 4%-6% due to the limited sunlight absorption because it is a dilemma that more photons need to be harvested in UV-vis-near-infrared (NIR) region to generate high photocurrent, which leads to the significant reduction of device transparency...
March 21, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28322045/9-73-efficiency-nonfullerene-all-organic-small-molecule-solar-cells-with-absorption-complementary-donor-and-acceptor
#5
Haijun Bin, Yankang Yang, Zhi-Guo Zhang, Long Ye, Masoud Ghasemi, Shanshan Chen, Yindong Zhang, Chunfeng Zhang, Chenkai Sun, Ling-Wei Xue, Changduk Yang, Harald Ade, Yongfang Li
In the last two years, polymer solar cells (PSCs) developed quickly with n-type organic semiconductor (n-OSs) as acceptor. In contrast, the research progress of nonfullerene organic solar cells (OSCs) with organic small molecule as donor and the n-OS as acceptor lags behind. Here, we synthesized a D-A structured medium bandgap organic small molecule H11 with bithienyl-benzodithiophene (BDT) as central donor unit and fluorobenzotriazole as acceptor unit, and achieved a power conversion efficiency (PCE) of 9...
March 21, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28317965/direct-observation-of-the-rise-of-delayed-fluorescence-in-dithienylbenzothiadiazole-and-its-role-in-the-excited-state-dynamics-of-a-donor-acceptor-donor-molecule
#6
Maneesha Esther Mohanty, Chakali Madhu, Vanammoole Lakshmi Reddy, Mahalingavelar Paramasivam, Prakriti Ranjan Bangal, Vaidya Jayathirtha Rao
Dithienylbenzothiadiazole (DTBT) is used as a building block in several molecules having application in organic light emitting devices (OLED) and organic photovoltaic (OPV) devices. Delayed fluorescence (DF) is the preferred design principle employed currently in OLED research. DTBT has excellent delayed fluorescence properties which makes this moiety a potentially viable OLED material. Here, the dynamics of intersystem crossing (ISC) and reverse intersystem crossing (RISC) have been explored using fluorescence, phosphorescence, fluorescence lifetime and transient absorption measurements...
March 20, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28317371/high-performance-near-infrared-luminescent-solar-concentrators
#7
Raquel Rondão, Ana Frias, Sandra Correia, Lianshe Fu, Verónica de Zea Bermudez, Paulo André, Rute A S Ferreira, Luis D Carlos
Luminescent solar concentrators (LSCs) appear as candidates to enhance the performance of photovoltaic (PV) cells and contribute to reduce the size of PV systems, decreasing, therefore, the amount of material needed, and thus the cost associated with energy conversion. One way to maximize the devices performance is to explore near infrared (NIR)-emitting centers, resonant with the maximum optical response of the most common Si-based PV cells. Nevertheless, very few examples in the literature demonstrate the feasibility of fabricating LSCs emitting in the NIR region...
March 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28303938/modulated-ch3nh3pbi3-xbrx-film-for-efficient-perovskite-solar-cells-exceeding-18
#8
Yongguang Tu, Jihuai Wu, Zhang Lan, Xin He, Jia Dong, Jinbiao Jia, Panfeng Guo, Jianming Lin, Miaoliang Huang, Yunfang Huang
The organic-inorganic lead halide perovskite layer is a crucial factor for the high performance perovskite solar cell (PSC). We introduce CH3NH3Br in the precursor solution to prepare CH3NH3PbI3-xBrx hybrid perovskite, and an uniform perovskite layer with improved crystallinity and apparent grain contour is obtained, resulting in the significant improvement of photovoltaic performance of PSCs. The effects of CH3NH3Br on the perovskite morphology, crystallinity, absorption property, charge carrier dynamics and device characteristics are discussed, and the improvement of open circuit voltage of the device depended on Br doping is confirmed...
March 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28303801/ultrathin-al2o3-interface-achieving-an-11-46-efficiency-in-planar-n-si-pedot-pss-hybrid-solar-cells
#9
Yoon-Ho Nam, Jae-Won Song, Min-Joon Park, Abdul Sami, Jung-Ho Lee
Hybrid organic-inorganic photovoltaic devices consisting of poly(3,4-etyhlenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) and n-type silicon have recently been investigated for their cost-efficiency and ease of fabrication. We demonstrate that the insertion of an ultrathin Al2O3 layer between n-Si and PEDOT:PSS significantly improves photovoltaic performance in comparison to the conventional interfacial oxide employing SiO2. A power-conversion efficiency of 11.46% was recorded at the optimal Al2O3 thickness of 2...
April 18, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28301059/enantiopure-vs-racemic-naphthalimide-end-capped-helicenic-non-fullerene-electron-acceptors-impact-on-organic-photovoltaics-performance
#10
Jeanne Crassous, Pierre Josse, Ludovic Favereau, Chengshuo Shen, Sylvie Dabos-Seignon, Philippe Blanchard, Clement Cabanetos
Impact of the enantiopurity on organic photovoltaics (OPV) performance was investigated through the synthesis of racemic and enantiomerically pure naphthalimide end-capped helicenes and their application as non-fullerene molecular electron acceptors in OPV devices. A very strong increase of the device performance was observed by simply switching from the racemic to the enantiopure forms of these pi-helical non-fullerene acceptors with power conversion efficiencies jumping from 0.4% to ca 2.0% in air-processed poly(3-hexylthiophene) based devices, thus highlighting the key role of enantiopurity in the photovoltaic properties...
March 16, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28300145/high-photoresponsivity-ge-dot-photomosfets-for-low-power-monolithically-integrated-si-optical-interconnects
#11
Ming-Hao Kuo, Meng-Chun Lee, Horng-Chih Lin, Tom George, Pei-Wen Li
We report the demonstration of high-photoresponsivity Ge-dot photoMOSFETs in a standard MOS configuration for the detection of 850-1550 nm illumination. Each device has a self-organized, gate-stacking heterostructure of SiO2/Ge-dot/SiO2/SiGe-channel which is simultaneously fabricated in a single oxidation step. Superior control of the geometrical size and chemical composition for our Ge nanodots/SiO2/Si1-xGex-shell MOS structure enables the practically-achievable, gate-stacking design for our Ge-dot photoMOSFETs...
March 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28299942/temperature-dependent-electric-field-poling-effects-in-ch3nh3pbi3-optoelectronic-devices
#12
Chuang Zhang, Dali Sun, Xiaojie Liu, Chuanxiang Sheng, Zeev Valy Vardeny
Organo-lead halide perovskites show excellent optoelectronic properties; however, the unexpected inconsistency in forward/backward I-V characteristics remains a problem for fabricating solar panels. Here we have investigated the reasons behind this "hysteresis" by following the changes in photocurrent/photoluminescence under electric field poling in transverse CH3NH3PbI3-based devices from 300 K to 10 K. We found that the hysteresis disappears at cryogenic temperatures, indicating the "freeze-out" of ionic diffusion contribution...
March 16, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28298084/small-molecule-acceptor-based-on-the-heptacyclic-benzodi-cyclopentadithiophene-unit-for-highly-efficient-nonfullerene-organic-solar-cells
#13
Bin Kan, Huanran Feng, Xiangjian Wan, Feng Liu, Xin Ke, Yanbo Wang, Yunchuang Wang, Hongtao Zhang, Chenxi Li, Jianhui Hou, Yongsheng Chen
A new nonfullerene small molecule with acceptor-donor-acceptor (A-D-A) structure, namely, NFBDT, based on a heptacyclic benzodi(cyclopentadithiophene) (FBDT) unit using benzo[1,2-b:4,5-b']dithiophene as the core unit, was designed and synthesized. Its absorption ability, energy levels, thermal stability, as well as photovoltaic performances were fully investigated. NFBDT exhibits a low optical bandgap of 1.56 eV resulting in wide and efficient absorption that covered the range from 600 to 800 nm, and suitable energy levels as an electron acceptor...
March 24, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28295982/light-harvesting-and-photocurrent-generation-in-a-conjugated-polymer-nanoparticle-reduced-graphene-oxide-composite
#14
Amitava Patra, Arnab Ghosh, Bikash Jana, Sourav Maiti, Rajesh Bera, Hiren Ghosh
Polymer - graphene nanocomposites are promising candidates towards light harvesting systems such as photocatalysis, photovoltaics; where significant charge separation occurs due to photoinduced electron transfer. Much attention has been paid to use reduced graphene oxide (r-GO) as template for anchoring various nanomaterials due to its efficient electron accepting and transport property. Here, we have prepared Poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV) nanoparticles from MEH-PPV polymer and investigate the change in photophysical properties due to formation of polymer nanoparticles from molecular state by using steady state and time resolved spectroscopy...
March 14, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/28287568/recombination-dynamics-in-thin-film-photovoltaic-materials-via-time-resolved-microwave-conductivity
#15
Joanna A Guse, Timothy W Jones, Andrew Danos, Dane R McCamey
A method for investigating recombination dynamics of photo-induced charge carriers in thin film semiconductors, specifically in photovoltaic materials such as organo-lead halide perovskites is presented. The perovskite film thickness and absorption coefficient are initially characterized by profilometry and UV-VIS absorption spectroscopy. Calibration of both laser power and cavity sensitivity is described in detail. A protocol for performing Flash-photolysis Time Resolved Microwave Conductivity (TRMC) experiments, a non-contact method of determining the conductivity of a material, is presented...
March 6, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28284703/high-resolution-monochromated-electron-energy-loss-spectroscopy-of-organic-photovoltaic-materials
#16
Jessica A Alexander, Frank J Scheltens, Lawrence F Drummy, Michael F Durstock, Fredrik S Hage, Quentin M Ramasse, David W McComb
Advances in electron monochromator technology are providing opportunities for high energy resolution (10 - 200meV) electron energy-loss spectroscopy (EELS) to be performed in the scanning transmission electron microscope (STEM). The energy-loss near-edge structure in core-loss spectroscopy is often limited by core-hole lifetimes rather than the energy spread of the incident illumination. However, in the valence-loss region, the reduced width of the zero loss peak makes it possible to resolve clearly and unambiguously spectral features at very low energy-losses (<3eV)...
March 2, 2017: Ultramicroscopy
https://www.readbyqxmd.com/read/28276675/effect-of-energy-alignment-electron-mobility-and-film-morphology-of-perylene-diimide-based-polymers-as-electron-transport-layer-on-the-performance-of-perovskite-solar-cells
#17
Qiang Guo, Yingxue Xu, Bo Xiao, Bing Zhang, Erjun Zhou, Fuzhi Wang, Yiming Bai, Tasawar Hayat, Ahmed Alsaedi, Zhan'ao Tan
For organic-inorganic perovskite solar cells (PerSCs), the electron transport layer (ETL) plays a crucial role in efficient electron extraction and transport for high performance PerSCs. Fullerene and its derivatives are commonly used as ETL for p-i-n structured PerSCs. However, these spherical small molecules are easy to aggregate with high annealing temperature and thus induce morphology stability problems. N-type conjugated polymers are promising candidates to overcome these problems due to the tunable energy levels, controllable aggregation behaviors, and good film formation abilities...
March 15, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28273950/methoxydiphenylamine-substituted-fluorene-derivatives-as-hole-transporting-materials-role-of-molecular-interaction-on-device-photovoltaic-performance
#18
Robertas Tiazkis, Sanghyun Paek, Maryte Daskeviciene, Tadas Malinauskas, Michael Saliba, Jonas Nekrasovas, Vygintas Jankauskas, Shahzada Ahmad, Vytautas Getautis, Mohammad Khaja Nazeeruddin
The molecular structure of the hole transporting material (HTM) play an important role in hole extraction in a perovskite solar cells. It has a significant influence on the molecular planarity, energy level, and charge transport properties. Understanding the relationship between the chemical structure of the HTM's and perovskite solar cells (PSCs) performance is crucial for the continued development of the efficient organic charge transporting materials. Using molecular engineering approach we have constructed a series of the hole transporting materials with strategically placed aliphatic substituents to investigate the relationship between the chemical structure of the HTMs and the photovoltaic performance...
December 2017: Scientific Reports
https://www.readbyqxmd.com/read/28272502/organic-photovoltaics-pushing-the-knowledge-of-interfaces
#19
Natalie Banerji
No abstract text is available yet for this article.
February 20, 2017: Nature Materials
https://www.readbyqxmd.com/read/28266750/hybrid-perovskite-light-emitting-diodes-based-on-perovskite-nanocrystals-with-organic-inorganic-mixed-cations
#20
Xiaoli Zhang, He Liu, Weigao Wang, Jinbao Zhang, Bing Xu, Ke Lin Karen, Yuanjin Zheng, Sheng Liu, Shuming Chen, Kai Wang, Xiao Wei Sun
Organic-inorganic hybrid perovskite materials with mixed cations have demonstrated tremendous advances in photovoltaics recently, by showing a significant enhancement of power conversion efficiency and improved perovskite stability. Inspired by this development, this study presents the facile synthesis of mixed-cation perovskite nanocrystals based on FA(1-x) Csx PbBr3 (FA = CH(NH2 )2 ). By detailed characterization of their morphological, optical, and physicochemical properties, it is found that the emission property of the perovskite, FA(1-x) Csx PbBr3 , is significantly dependent on the substitution content of the Cs cations in the perovskite composition...
March 7, 2017: Advanced Materials
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