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https://www.readbyqxmd.com/read/28727458/unraveling-the-high-voc-and-high-performance-of-integrated-perovskite-organic-bulk-heterojunction-solar-cells
#1
Shiqi Dong, Yongsheng Liu, Ziruo Hong, En-Ping Yao, Pengyu Sun, Lei Meng, Yuze Lin, Jinsong Huang, Gang Li, Yang Yang
We have demonstrated high performance integrated perovskite/bulk-heterojunction (BHJ) solar cells due to the low carrier recombination velocity, high open circuit voltage (Voc) and increased light absorption ability in near-infrared (NIR) region of integrated devices. In particular, we find that the Voc of the integrated devices is dominated by (or pinned to) the perovskite cells, not the OPV cells. A Quasi-Fermi Level Pinning Model was proposed to understand the working mechanism and the origin of the Voc of the integrated perovskite/BHJ solar cell, which following that of the perovskite solar cell and is much higher than that of the low bandgap polymer based organic BHJ solar cell...
July 20, 2017: Nano Letters
https://www.readbyqxmd.com/read/28727320/plasmonic-gold-nanostars-incorporated-into-high-efficiency-perovskite-solar-cells
#2
Munkhbayar Batmunkh, Thomas Macdonald, William Peveler, Abdulaziz Bati, Claire J Carmalt Claire J Carmalt, Ivan Parkin, Joseph George Shapter
Incorporating appropriate plasmonic nanostructures into photovoltaic (PV) systems is of great utility for enhancing photon absorption and thus improving device performance. Herein, the successful integration of plasmonic gold nanostars (AuNSs) into mesoporous TiO2 photoelectrodes for perovskite solar cells (PSCs) is reported. The PSCs fabricated with TiO2-AuNSs photoelectrodes exhibited a device efficiency of up to 17.72%, while the control cells without AuNSs showed a maximum efficiency of 15.19%. We attribute the origin of increased device performance to enhanced light absorption and suppressed charge recombination...
July 20, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28726867/fluorine-substituted-benzothiadiazole-based-hole-transport-materials-for-highly-efficient-planar-perovskite-solar-cells-with-a-ff-exceeding-80
#3
Fei Wu, Yu Ji, Cheng Zhong, Yuan Liu, Luxi Tan, Linna Zhu
Fluorine-substituted benzothiadiazole (BT) was introduced as a core structure to construct new hole transport materials. Planar perovskite solar cells with conventional materials (CH3NH3PbI3-xClx) were fabricated. The perovskite solar cells using monofluorinated BT exhibit a leading efficiency of 18.54% with a FF as high as 81%.
July 20, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28726374/impact-of-thermal-annealing-on-organic-photovoltaic-cells-using-regioisomeric-donor-acceptor-acceptor-molecules
#4
Tao Zhang, Han Han, Yunlong Zou, Ying-Chi Lee, Hiroya Oshima, Ken-Tsung Wong, Russell J Holmes
We report a promising set of donor-acceptor-acceptor (D-A-A) electron-donor materials based on coplanar thieno[3,2-b]/[2,3-b]indole, benzo[c][1,2,5]thiadiazole, and dicyanovinylene, which are found to show broadband absorption with high extinction coefficients. The role of the regioisomeric electron-donating thienoindole moiety on the physical and structural properties is examined. Bulk heterojunction (BHJ) organic photovoltaic cells (OPVs) based on the thieno[2,3-b]indole-based electron donor NTU-2, using C70 as an electron acceptor, show a champion power conversion efficiency of 5...
July 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28726369/comprehensive-study-of-sol-gel-versus-hydrolysis-condensation-methods-to-prepare-zno-films-electron-transport-layers-in-perovskite-solar-cells
#5
Yuhan Zhao, Kai-Cheng Zhang, Zhao-Wei Wang, Peng Huang, Kai Zhu, Zhendong Li, Dahua Li, Ligang Yuan, Yi Zhou, Bo Song
Owing to the high charge mobility and low processing temperature, ZnO is regarded as an ideal candidate for electron transport layer (ETL) material in thin-film solar cells. For the film preparation, the presently dominated sol-gel (SG) and hydrolysis-condensation (HC) methods show great potential, however, the effect of these two methods on the performance of the resulting devices has not been investigated in the same frame. In this study, the ZnO films made through SG and HC methods were applied in perovskite solar cells (Pero-SCs), and the performances of corresponding devices were compared under parallel conditions...
July 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28724899/carrier-dynamics-of-mn-induced-states-in-gan-thin-films
#6
Yu-Ting Chen, Chi-Yuan Yang, Po-Cheng Chen, Jinn-Kong Sheu, Kung-Hsuan Lin
GaN-based materials are widely used for light emission devices, but the intrinsic property of wide bandgap makes it improper for photovoltaic applications. Recently, manganese was doped into GaN for absorption of visible light, and the conversion efficiency of GaN-based solar cells has been greatly improved. We conducted transient optical measurements to study the carrier dynamics of Mn-doped GaN. The lifetime of carriers in the Mn-related intermediate bands (at 1.5 eV above the valence band edge) is around 1...
July 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28724895/efficient-two-step-photocarrier-generation-in-bias-controlled-inas-gaas-quantum-dot-superlattice-intermediate-band-solar-cells
#7
T Kada, S Asahi, T Kaizu, Y Harada, R Tamaki, Y Okada, T Kita
We studied the effects of the internal electric field on two-step photocarrier generation in InAs/GaAs quantum dot superlattice (QDSL) intermediate-band solar cells (IBSCs). The external quantum efficiency of QDSL-IBSCs was measured as a function of the internal electric field intensity, and compared with theoretical calculations accounting for interband and intersubband photoexcitations. The extra photocurrent caused by the two-step photoexcitation was maximal for a reversely biased electric field, while the current generated by the interband photoexcitation increased monotonically with increasing electric field intensity...
July 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28723678/carrier-transport-dynamics-in-mn-doped-cdse-quantum-dot-sensitized-solar-cells
#8
Uma Poudyal, Franscis Scott Maloney, Keshab Raj Sapkota, Wenyong Wang
In this work quantum dot sensitized solar cells (QDSSCs) were fabricated with CdSe and Mn-doped CdSe quantum dots (QDs) using the SILAR method. QDSSCs based on Mn-doped CdSe QDs exhibited improved incident photon-to-electron conversion efficiency. Carrier transport dynamics in the QDSSCs were studied using the intensity modulated photocurrent/photovoltage spectroscopy technique, from which transport and recombination time constants could be derived. Compared to CdSe QDSSCs, Mn-CdSe QDSSCs exhibited shorter transport time constant, longer recombination time constant, longer diffusion length, and higher charge collection efficiency...
July 19, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28722350/multidimensional-anodized-titanium-foam-photoelectrode-for-efficient-utilization-of-photons-in-mesoscopic-solar-cells
#9
Jin Soo Kang, Hyelim Choi, Jin Kim, Hyeji Park, Jae-Yup Kim, Jung-Woo Choi, Seung-Ho Yu, Kyung Jae Lee, Yun Sik Kang, Sun Ha Park, Yong-Hun Cho, Jun-Ho Yum, David C Dunand, Heeman Choe, Yung-Eun Sung
Mesoscopic solar cells based on nanostructured oxide semiconductors are considered as a promising candidates to replace conventional photovoltaics employing costly materials. However, their overall performances are below the sufficient level required for practical usages. Herein, this study proposes an anodized Ti foam (ATF) with multidimensional and hierarchical architecture as a highly efficient photoelectrode for the generation of a large photocurrent. ATF photoelectrodes prepared by electrochemical anodization of freeze-cast Ti foams have three favorable characteristics: (i) large surface area for enhanced light harvesting, (ii) 1D semiconductor structure for facilitated charge collection, and (iii) 3D highly conductive metallic current collector that enables exclusion of transparent conducting oxide substrate...
July 19, 2017: Small
https://www.readbyqxmd.com/read/28722326/a-hydroxamic-acid-anchoring-group-for-durable-dye-sensitized-solar-cells-with-a-cobalt-redox-shuttle
#10
Tomohiro Higashino, Yuma Kurumisawa, Ning Cai, Yamato Fujimori, Yukihiro Tsuji, Shimpei Nimura, Daniel Packwood, Jaehong Park, Hiroshi Imahori
A hydroxamic acid group has been employed for the first time as an anchoring group for cobalt-based dye-sensitized solar cells (DSSCs). The porphyrin dye YD2-o-C8HA with the hydroxamic acid anchoring group exhibited a power conversion efficiency (η) of 6.4%, which is close to that of YD2-o-C8, a representative porphyrin dye with a conventional carboxylic acid one. More importantly, YD2-o-C8HA was found to be superior to YD2-o-C8 in terms of both binding ability to TiO2 and durability of cobalt-based DSSCs...
July 18, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28721721/unveil-the-concentration-dependent-grain-growth-of-perovskite-films-from-one-step-and-two-step-deposition-methods-implications-for-photovoltaic-application
#11
Alison E Lewis, Yi Zhang, Peng Gao, Mohammad Khaja Nazeeruddin
In order to achieve high efficiency perovskite solar cells, understanding both the crystal structure and the opto-electronic properties of perovskite layers are of importance. This paper uses crystallization analysis and modelling study of two different perovskites deposition methods (two-step and one-step methods) and thereby shows that the one-step method embodies a film formation process that is dominated by crystal growth, while the dominant mechanism of the two-step procedure is nucleation. Our data based on the experimental and the theory shows that the one-step recipe is superior in terms of morphology control and hence the reproducibility compared to the two-step recipe...
July 19, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28721411/power-output-and-carrier-dynamics-studies-of-perovskite-solar-cells-under-working-conditions
#12
Man Yu, Hao-Yi Wang, Ming-Yang Hao, Yujun Qin, Li-Min Fu, Jian-Ping Zhang, Xi-Cheng Ai
Perovskite solar cells have emerged as promising photovoltaic systems with superb power conversion efficiency. For the practical application of perovskite devices, the greatest concerns are the power output density and the related dynamics under working conditions. In this study, the working conditions of planar and mesoscopic perovskite solar cells are simulated and the power output density evolutions with the working voltage are highlighted. The planar device exhibits higher capability of outputting power than the mesoscopic one...
July 19, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28721402/on-the-efficiency-limit-of-zno-ch3nh3pbi3-cui-perovskite-solar-cells
#13
Yaroslav B Martynov, Rashid G Nazmitdinov, Andreu Moià-Pol, Pavel P Gladyshev, Alexey R Tameev, Anatoly V Vannikov, Mihal Pudlak
Organometal triiodide perovskites are promising, high-performance absorbers in solar cells. Considering the perovskite as a thin film absorber, we solve transport equations and analyse the efficiency of a simple heterojunction configuration as a function of electron-hole diffusion lengths. We found that for a thin film thickness of ≃1 μm the maximum efficiency of ≃31% could be achieved at the diffusion length of ∼100 μm.
July 19, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28719969/dmf-as-an-additive-in-two-step-spin-coating-method-for-20-conversion-efficiency-perovskite-solar-cells
#14
Jionghua Wu, Xin Xu, Yanhong Zhao, Jiangjian Shi, Yuzhuan Xu, Yanhong Luo, Dongmei Li, Huijue Wu, Qingbo Meng
DMF as additive has been employed in FAI/MAI/IPA (FA= CH2 (NH2)2, MA=CH3NH3, IPA is isopropanol) solution for two-step multi-cycle spin coating method in order to prepare high quality FAxMA1-xPbI2.55Br0.45 perovskite films. Further investigation reveals that the existence of DMF in the FAI/MAI/IPA solution can facilitate perovskite conversion, improve the film morphology and reduce crystal defects, thus enhance charge transfer efficiency. By optimization toward the DMF amount and spin coating cycles, compact, pinhole-free perovskite films are obtained...
July 19, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28718618/graphene-oxide-by-uv-ozone-treatment-as-efficient-hole-extraction-layer-for-highly-efficient-and-stable-polymer-solar-cells
#15
Yingdong Xia, Yufeng Pan, Haijuan Zhang, Jian Qiu, Yiting Zheng, YongHua Chen, Wei Huang
Hole extraction layer has significant impact on achieving high-efficiency polymer solar cells (PSCs). Here, we report an efficient approach to by direct UV-Ozone treatment larger device performance enhancement employing grapheme oxide (GO). The dramatically performance enhancement of PSCs with P3HT:PCBM blend as an active layer was demonstrated by UV-Ozone treated GO for 30 min: best PCE of 4.18%, FF of 0.63, Jsc of 10.94 mA cm-2, and Voc of 0.61 V, which is significantly higher than the untreated GO (1.82%) and highly comparable PEDOT:PSS-based PSCs (3...
July 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28718472/unveiling-the-irreversible-performance-degradation-of-organo-inorganic-halide-perovskite-films-and-solar-cells-during-heating-and-cooling-processes
#16
Abdullah Al Mamun, Tanzila Tasnim Ava, Hye Ryung Byun, Hyeon Jun Jeong, Mun Seok Jeong, Loi Nguyen, Christine Gausin, Gon Namkoong
While organo-inorganic halide perovskite solar cells show great potential to meet future energy needs, their thermal instability raises serious questions about their commercialization viability. At present, the stability of perovskite solar cells has been studied under various environmental conditions including humidity and temperature. Nonetheless, understanding of the performance of CH3NH3PbI3-xClx perovskite solar cells is limited. This study reports the irreversible performance degradation of CH3NH3PbI3-xClx perovskite solar cells during the heating and cooling processes under AM 1...
July 18, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28718290/enhanced-long-term-and-thermal-stability-of-polymer-solar-cells-in-air-at-high-humidity-with-the-formation-of-unusual-quantum-dot-networks
#17
Long Tan, Fan Yang, Mee Rahn Kim, Pandeng Li, Deepak Thrithamarassery Gangadharan, Joelle Margot, Ricardo Izquierdo, Mohamed Chaker, Dongling Ma
Due to the practical applications of polymer solar cells (PSCs), their stability recently has received increasing attention. Herein, a new strategy was developed to largely enhance the long-term and thermal stability of PSCs in air with a relatively high humidity of 50-60% without any encapsulation. In this strategy, semiconductor PbS/CdS core/shell quantum dots (QDs) were incorporated into the photoactive blend of poly(3-hexylthiophene) (P3HT) and phenyl-C61-butyric acid methyl ester (PCBM). By replacing the initial ligands of oleic acid with halide ligands on the surface of PbS/CdS QDs via solution-phase-ligand-exchange, we were able to form unusual, continuous QD networks in the film of P3HT:PCBM, which effectively stabilized the photoactive layer...
July 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28717231/a-connection-from-stratospheric-ozone-to-el-ni%C3%A3-o-southern-oscillation
#18
Desmond Manatsa, Geoffrey Mukwada
We use reanalysis and observational data to link the lower stratospheric ozone regulation of the ultraviolet radiation (UV-B) component of solar energy to ENSO modulation. Results indicate that during ENSO extremes, the Walker Circulation (WC) and Brewer Dobson Circulation are related to lower stratospheric ozone alterations east of the date line over the Pacific. These in turn are linked to upper tropospheric anomalous dipole temperature patterns on either side of the equator. The ensuing changes in geopotential height values do not only drive equatorial zonal wind anomalies in the upper troposphere that are reversed at the equatorial surface, but also impact on the intensity of the South Pacific High circulation...
July 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28715369/electrospinning-of-photocatalytic-electrodes-for-dye-sensitized-solar-cells
#19
Nicolò Canever, Fraser Hughson, Thomas J Macdonald, Thomas Nann
This work demonstrates a protocol to fabricate a fiber-based photoanode for dye-sensitized solar cells, consisting of a light-scattering layer made of electrospun titanium dioxide nanofibers (TiO2-NFs) on top of a blocking layer made of commercially available titanium dioxide nanoparticles (TiO2-NPs). This is achieved by first electrospinning a solution of titanium (IV) butoxide, polyvinylpyrrolidone (PVP), and glacial acetic acid in ethanol to obtain composite PVP/TiO2 nanofibers. These are then calcined at 500 °C to remove the PVP and to obtain pure anatase-phase titania nanofibers...
June 28, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28715091/strongly-enhanced-photovoltaic-performance-and-defect-physics-of-air-stable-bismuth-oxyiodide-bioi
#20
Robert L Z Hoye, Lana C Lee, Rachel C Kurchin, Tahmida N Huq, Kelvin H L Zhang, Melany Sponseller, Lea Nienhaus, Riley E Brandt, Joel Jean, James Alexander Polizzotti, Ahmed Kursumović, Moungi G Bawendi, Vladimir Bulović, Vladan Stevanović, Tonio Buonassisi, Judith L MacManus-Driscoll
Bismuth-based compounds have recently gained increasing attention as potentially nontoxic and defect-tolerant solar absorbers. However, many of the new materials recently investigated show limited photovoltaic performance. Herein, one such compound is explored in detail through theory and experiment: bismuth oxyiodide (BiOI). BiOI thin films are grown by chemical vapor transport and found to maintain the same tetragonal phase in ambient air for at least 197 d. The computations suggest BiOI to be tolerant to antisite and vacancy defects...
July 17, 2017: Advanced Materials
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