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organic photovoltaic

Jesus Idigoras, Francisco Javier Aparicio, Lidia Contreras-Bernal, Susana Ramos-Terrón, María Alcaire, Juan R Sanchez-Valencia, Ana Borras, Angel Barranco, Juan Antonio Anta
A compromise between high power conversion efficiency and long-term stability of hybrid organic-inorganic metal halide perovskite solar cells is necessary for their outdoor photovoltaic application and commercialization. Herein, a method to improve the stability of perovskite solar cells under water and moisture exposure consisting in the encapsulation of the cell with an ultrathin plasma polymer is reported. The deposition of the polymer is carried out at room temperature by the remote plasma vacuum deposition of adamantane powder...
March 19, 2018: ACS Applied Materials & Interfaces
Lesley W Chan, Daniel E Morse, Michael J Gordon
Near- and sub-wavelength photonic structures are used by numerous organisms (e.g., insects, cephalopods, fish, birds) to create vivid and often dynamically-tunable colors, as well as create, manipulate, or capture light for vision, communication, crypsis, photosynthesis, and defense. This review introduces the physics of moth eye (ME)-like, biomimetic nanostructures and discusses their application to reduce optical losses and improve efficiency of various optoelectronic devices, including photodetectors, photovoltaics, imagers, and light emitting diodes...
March 16, 2018: Bioinspiration & Biomimetics
Juan Zhao, Zhihe Chi, Zhan Yang, Xiaojie Chen, Michael S Arnold, Yi Zhang, Jiarui Xu, Zhenguo Chi, Matthew P Aldred
Truly stretchable electronics, wherein all components themselves permit elastic deformation as the whole devices are stretched, exhibit unique advantages over other strategies, such as simple fabrication process, high integrity of entire components and intimate integration with curvilinear surfaces. In contrast to the stretchable devices using stretchable interconnectors to integrate with rigid active devices, truly stretchable devices are realized with or without intentionally employing structural engineering (e...
March 15, 2018: Nanoscale
Bo Li, Yanan Zhang, Lin Fu, Tong Yu, Shujie Zhou, Luyuan Zhang, Longwei Yin
Owing to inevitable thermal/moisture instability for organic-inorganic hybrid perovskites, pure inorganic perovskite cesium lead halides with both inherent stability and prominent photovoltaic performance have become research hotspots as a promising candidate for commercial perovskite solar cells. However, it is still a serious challenge to synthesize desired cubic cesium lead iodides (CsPbI3 ) with superior photovoltaic performance for its thermodynamically metastable characteristics. Herein, polymer poly-vinylpyrrolidone (PVP)-induced surface passivation engineering is reported to synthesize extra-long-term stable cubic CsPbI3 ...
March 14, 2018: Nature Communications
S Oviedo-Casado, A Urbina, J Prior
A correction to this article has been published and is linked from the HTML and PDF versions of this paper. The error has been fixed in the paper.
March 13, 2018: Scientific Reports
Lijian Zuo, Xueliang Shi, Sae Byeok Jo, Yun Liu, Fracis Lin, Alex K-Y Jen
Limited by the various inherent energy losses from multiple channels, organic solar cells show inferior device performance compared to traditional inorganic photovoltaic techniques, such as silicon and CuInGaSe. To alleviate these fundamental limitations, an integrated multiple strategy is implemented including molecular design, interfacial engineering, optical manipulation, and tandem device construction into one cell. Considering the close correlation among these loss channels, a sophisticated quantification of energy-loss reduction is tracked along with each strategy in a perspective to reach rational overall optimum...
March 13, 2018: Advanced Materials
Bhupal Kattel, Liang Qin, Tika R Kafle, Wai-Lun Chan
In organic and low-dimensional materials, electrons and holes are bound together to form excitons. Effective exciton dissociation at interfaces is essential for applications such as photovoltaics and photosensing. Here, we present an interface-sensitive, time-resolved method that utilizes graphene field effect transistor as an electric-field sensor to measure the charge separation dynamics and yield at donor-acceptor interfaces. Compared to other interface-sensitive spectroscopy techniques, our method has a much reduced measurement time and can be easily adapted to different material interfaces...
March 13, 2018: Journal of Physical Chemistry Letters
Wanning Li, Long Ye, Sunsun Li, Huifeng Yao, Harald Ade, Jianhui Hou
Besides broadening of the absorption spectrum, modulating molecular energy levels, and other well-studied properties, a stronger intramolecular electron push-pull effect also affords other advantages in nonfullerene acceptors. A strong push-pull effect improves the dipole moment of the wings in IT-4F over IT-M and results in a lower miscibility than IT-M when blended with PBDB-TF. This feature leads to higher domain purity in the PBDB-TF:IT-4F blend and makes a contribution to the better photovoltaic performance...
March 13, 2018: Advanced Materials
Yao Liu, Zachariah A Page, Dongming Zhou, Volodimyr V Duzhko, Kevin R Kittilstved, Todd Emrick, Thomas P Russell
While perovskite solar cells have invigorated the photovoltaic research community due to their excellent power conversion efficiencies (PCEs), these devices notably suffer from poor stability. To address this crucial issue, a solution-processable organic chemical inhibition layer (OCIL) was integrated into perovskite solar cells, resulting in improved device stability and a maximum PCE of 16.3%. Photoenhanced self-doping of the fulleropyrrolidine mixture in the interlayers afforded devices that were advantageously insensitive to OCIL thickness, ranging from 4 to 190 nm...
February 28, 2018: ACS Central Science
Hideaki Komiyama, Takahiro To, Seiichi Furukawa, Yu Hidaka, Woong Shin, Takahiro Ichikawa, Ryota Arai, Takuma Yasuda
Solution-processed organic solar cells (OSCs) based on narrow-bandgap small molecules hold great promise as next-generation energy-converting devices. In this paper, we focus on a family of A-π-D-π-A-type small molecules, namely, BDT-nT-ID (n = 1-4) oligomers, consisting of benzo[1,2-b:4,5-b']dithiophene (BDT) as the central electron-donating (D) core, 1,3-indandione (ID) as the terminal electron-accepting (A) units, and two regioregular oligo(3-hexylthiophene)s (nT) with different numbers of thiophene rings as the π-bridging units, and elucidate their structure-property-function relationships...
March 12, 2018: ACS Applied Materials & Interfaces
Furqan Almyahi, Thomas R Andersen, Nathan A Cooling, Natalie P Holmes, Matthew J Griffith, Krishna Feron, Xiaojing Zhou, Warwick J Belcher, Paul C Dastoor
In this study we have optimised the preparation conditions for large-volume nanoparticle inks, based on poly(3-hexylthiophene) (P3HT):indene-C60 multiadducts (ICxA), through two purification processes: centrifugal and crossflow ultrafiltration. The impact of purification is twofold: firstly, removal of excess sodium dodecyl sulfate (SDS) surfactant from the ink and, secondly, concentration of the photoactive components in the ink. The removal of SDS was studied in detail both by a UV-vis spectroscopy-based method and by surface tension measurements of the nanoparticle ink filtrate; revealing that centrifugal ultrafiltration removed SDS at a higher rate than crossflow ultrafiltration even though a similar filter was applied in both cases (10,000 Da M w cut-off)...
2018: Beilstein Journal of Nanotechnology
Yan Xie, Jianrong Gao, Shaozheng Zhang, Liang Wu
Four novel metal-free organic dyes (CFB1, CFB2, CFT1 and CFT2) based on indeno[2,1-b]carbazole donors were synthesized and their absorption spectra, photovoltaic performances, and electrochemical properties were evaluated. The differences in linking mode and the number of thiophene units led to variations in absorptivity, electron injection efficiency, and charge recombination. Among the four dyes, CFT1 with a π-bridge at the indeno[2,1-b]carbazole ring and a bridge of thiophene showed the best photovoltaic performance with a JSC of 12...
March 7, 2018: Photochemical & Photobiological Sciences
Antonio Benedetto, Pietro Ballone
Empirical evidence and conceptual elaboration reveal and rationalise the remarkable affinity of organic ionic liquids for biomembranes. Cations of the so-called room-temperature ionic liquids (RTILs), in particular, are readily absorbed into the lipid fraction of biomembranes, causing a variety of observable biological effects, including generic cytotoxicity, broad anti-bacterial potential, and anti-cancer activity. Chemical-physics analysis of model systems made of phospholipid bilayers, RTIL ions and water confirm and partly explain this evidence, quantifying the mild destabilising effect of RTILs on structural, dynamical and thermodynamic properties of lipids in biomembranes...
March 6, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Ashish Kulkarni, Trilok Singh, Ajay Kumar Jena, Peerathat Pinpithak, Masashi Ikegami, Tsutomu Miyasaka
Low stability of organic-inorganic lead halide perovskite and toxicity of lead (Pb) quest for alternative non-toxic and stable light absorbing materials with promising optoelectronic properties. Herein, we report about non-toxic bismuth triiodide (BiI3) photovoltaic device prepared using TiO2 mesoporous film and spiro-OMeTAD as electron and hole transporting materials, respectively. Effect of annealing methods (e.g. thermal annealing-TA, solvent vapour annealing-SVA, pot-roast vapour annealing-PR-VA) and different annealing temperatures (90, 120, 150 and 180 OC for PR-VA) on BiI3 film morphology was investigated...
March 6, 2018: ACS Applied Materials & Interfaces
Christos Chochos, Ranbir Singh, Vasilis Gregoriou, Min Kim, Athanasios Katsouras, Efthymis Serpetzoglou, Ioannis Konidakis, Emmanuel Stratakis, Kilwon Cho, Apostolos Avgeropoulos
We report on the photovoltaic parameters, photophysical properties, optoelectronic properties, self-assembly and morphology variation in a series of high performance donor-acceptor (D-A) π-conjugated polymers based on indacenodithiophene and quinoxaline moieties as a function of the number-average molecular weight (("M" _"n" ) ̅), the nature of aryl substituents and the enlargement of the polymer backbone. One of the most important outcome is that from the three optimization approaches followed to tune the chemical structure towards enhanced photovoltaic performance in bulk heterojunction (BHJ) solar cell devices with the fullerene derivative [6,6]-phenyl-C71-butyric acid methyl ester (PC71BM) as the electron acceptor, the choice of the aryl substituent is the most efficient rational design strategy...
March 6, 2018: ACS Applied Materials & Interfaces
Qingde Sun, Jing Wang, Wan-Jian Yin, Yanfa Yan
Despite the rapid progress in solar power conversion efficiency of archetype organic-inorganic hybrid perovskite CH3 NH3 PbI3 -based solar cells, the long-term stability and toxicity of Pb remain the main challenges for the industrial deployment, leading to more uncertainties for global commercialization. The poor stabilities of CH3 NH3 PbI3 -based solar cells may not only be attributed to the organic molecules but also the halides themself, most of which exhibit intrinsic instability under moisture and light...
March 6, 2018: Advanced Materials
Nathaniel J L K Davis, Jesse R Allardice, James Xiao, Anthony J Petty Ii, Neil C Greenham, John E Anthony, Akshay Rao
Singlet exciton fission allows for the generation of two triplet excitons for each photon absorbed within an organic semiconductor. Efficient harvesting of these triplets could allow for the Shockley-Queisser limit on the power conversion efficiency of single-junction photovoltaics to be broken. Here, we show that singlet fission molecules bound directly to PbS quantum dots as ligands can undergo singlet fission with near unity efficiency and can transfer triplets sequentially into the PbS with near unity efficiency...
March 5, 2018: Journal of Physical Chemistry Letters
Anders Fredrik Elfwing, Wanzhu Cai, Liangqi Ouyang, Xianjie Liu, Yuxin Xia, Zheng Tang, Olle Inganäs
A new solution processable electron transport material (ETM) is introduced for use in photovoltaic devices, which consists of a metallic conjugated polyelectrolyte, poly(4-(2,3-dihydrothieno[3,4- b][1,4]dioxin-2-yl-methoxy)-1-butanesulfonic acid (PEDOT-S), and surfactant-functionalized deoxyribonucleic acid (DNA) (named DNA: CTMA: PEDOT-S). This ETM is demonstrated to effectively work for bulk-heterojunction organic photovoltaic devices (OPV) based on different electron acceptor materials. The fill factor, open circuit voltage and the overall power conversion efficiency of the solar cells with a DNA: CTMA: PEDOT-S modified cathode are comparable to that of devices with a traditional Lithium fluoride/Aluminum cathode...
March 5, 2018: ACS Applied Materials & Interfaces
Yao Liu, Marcus D Cole, Yufeng Jiang, Paul Y Kim, Dennis Nordlund, Todd Emrick, Thomas P Russell
Solution-based processing of materials for electrical doping of organic semiconductor interfaces is attractive for boosting the efficiency of organic electronic devices with multilayer structures. To simplify this process, self-doping perylene diimide (PDI)-based ionene polymers are synthesized, in which the semiconductor PDI components are embedded together with electrolyte dopants in the polymer backbone. Functionality contained within the PDI monomers suppresses their aggregation, affording self-doping interlayers with controllable thickness when processed from solution into organic photovoltaic devices (OPVs)...
March 5, 2018: Advanced Materials
Olga Nazarenko, Martin R Kotyrba, Sergii Yakunin, Marcel Aebli, Gabriele Raino, Bogdan M Benin, Michael Wörle, Maksym V Kovalenko
Two-dimensional hybrid organic-inorganic lead halides perovskite-type compounds attracted immense scientific interest due to their remarkable optoelectronic properties and tailorable crystal structures. In this work, we present a new layered hybrid lead halide, namely [CH(NH2)2][C(NH2)3]PbI4, wherein puckered lead-iodide layers are separated by two small and stable organic cations: formamidinium, CH(NH2)2+, and guanidinium, C(NH2)3+. This perovskite is thermally stable up to 255 oC, exhibits room-temperature photoluminescence in the red region with a quantum yield of 3...
March 4, 2018: Journal of the American Chemical Society
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