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solar cell

Yasunari Tamai, Yeli Fan, Vincent O Kim, Kostiantyn Ziabrev, Akshay Rao, Stephen Barlow, Seth R Marder, Richard H Friend, S Matthew Menke
Rapid, long-range charge separation in polymer-fullerene organic solar cells (OSCs) enables electrons and holes to move beyond their Coulomb capture radius and overcome geminate recombination. Understanding the nature of charge generation and recombination mechanisms in efficient, nonfullerene-acceptor-based OSCs are critical to further improve device performance. Here we report charge dynamics in an OSC using a perylene diimide (PDI) dimer acceptor. We use transient absorption spectroscopy to track the time evolution of electroabsorption caused by the dipolar electric field generated between electron-hole pairs as they separate after ionization at the donor-acceptor interface...
November 17, 2017: ACS Nano
Ah Reum Jeong, Sung Bin Choi, Won Mok Kim, Jong-Keuk Park, Jihye Choi, Inho Kim, Jeung-Hyun Jeong
A monolithic tandem solar cell consisting of crystalline Si (c-Si)/indium tin oxide (ITO)/CuGaSe2 (CGSe) was demonstrated by stacking a CGSe solar cell on a c-Si/ITO solar cell to obtain a photovoltaic conversion efficiency of about 10%. Electrical analyses based on cell-selective light absorption were applied to individually characterize the photovoltaic performances of the top and bottom subcells. Illumination at a frequency that could be absorbed only by a targeted top or bottom subcell permitted measurement of the open-circuit voltage of the target subcell and the shunt resistance of the non-target subcell...
November 16, 2017: Scientific Reports
Pascal Nbelayim, Go Kawamura, Wai Kian Tan, Hiroyuki Muto, Atsunori Matsuda
The use of plasmonic nanoparticles (NPs) in dye-sensitized solar cells (DSSCs) in an effort to enhance their power conversion efficiencies (PCEs) increases light absorbance of the cells but also affect their electron dynamics. This has contributed to the failure of plasmonic NPs to make the expected high impact of PCE enhancement. Herein, we investigated the wide range effects of plasmonic NPs on the performance of DSSCs, using extended characterization and a systematic approach. We prepared DSSCs using Ag@TiO2 NPs-doped TiO2 photoanodes...
November 16, 2017: Scientific Reports
Yongxi Li, Jiu-Dong Lin, Xiaozhou Che, Yue Qu, Feng Liu, Liang-Sheng Liao, Stephen R Forrest
The absence of near-infrared (NIR) solar cells with high open circuit voltage (Voc) and external quantum efficiency (EQE) has impeded progress toward achieving organic photovoltaic (OPV) power conversion efficiency PCE > 15%. Here we report a small energy gap (1.3 eV), chlorinated nonfullerene acceptor-based solar cell with PCE = 11.2 ± 0.4%, short circuit current of 22.5 ± 0.6 mA cm(-2), Voc = 0.70 ± 0.01 V and fill factor of 0.71 ± 0.02, which is the highest performance reported to date for NIR single junction OPVs...
November 16, 2017: Journal of the American Chemical Society
Heesoo Park, Fahhad H Alharbi, Stefano Sanvito, Nouar Tabet, Fedwa El-Mellouhi
In the quest for non-toxic and stable perovskites for solar cells, we conduct a systematic study of the effect of chalcogen content in oxychalcogenide perovskite using density functional theory (DFT) and quasi-particle perturbation theory. We explore the changes in the electronic structure due to the substitution of O atoms in NaNbO 3 and NaTaO 3 perovskite structures with various chalcogen (S, Se, Te) at different concentrations. Interestingly, the introduction of the chalcogen atoms results in a drastic reduction of the electronic band gap, making some of them fall within the visible range of the solar spectrum...
November 16, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
Agnes Weiss, Helmut Weiss
Small photovoltaic plants in private ownership are typically rated at 5 kW (peak). The panels are mounted on roofs at a decline angle of 20° to 45°. In winter time, a dense layer of snow at a width of e.g., 10 cm keeps off solar radiation from the photovoltaic cells for weeks under continental climate conditions. Practically, no energy is produced over the time of snow coverage. Only until outside air temperature has risen high enough for a rather long-time interval to allow partial melting of snow; the snow layer rushes down in an avalanche...
November 16, 2017: Environmental Science and Pollution Research International
Jiajing Feng, Wei Jiang, Zhaohui Wang
Rylene imide dyes have been among the most promising organic semiconducting materials for several years due to their remarkable optoelectronic properties and high chemical/thermal persistency. In the past decades, various spendid rylene imide dyes have been developed for optoelectronic devices, such as organic solar cells (OSCs) and organic field-effect transistors (OFETs). Recently, tremendous progress of perylene diimides (PDIs) and the analogues used in OSCs has been witnessed attributed to their ease of functionalization...
November 16, 2017: Chemistry, An Asian Journal
Haeri Kim, Se Jin Park, Byungwoo Kim, Yun Jeong Hwang, Byoung Koun Min
CuIn1-xGaxS2-ySey (CIGSSe) thin films have attracted a great deal of attention as a promising absorbing material for solar cell applications due to their favorable optical properties (e.g. a direct band gap and high absorption coefficients) and stable structure. Many studies have sought to improve the efficiency of solar cells using these films, and it has been found that surface modification via post heat treatment can lead to surface passivation of surface defects and a subsequent increase in efficiency. The surface properties of solution-processed CIGSSe films are considered to be particularly important in this respect due to the fact they are more prone to defects...
November 15, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
Qing-Qing Pan, Shuang-Bao Li, Ying-Chen Duan, Yong Wu, Ji Zhang, Yun Geng, Liang Zhao, Zhong-Min Su
The interface characteristic is a crucial factor determining the power conversion efficiency of organic solar cells (OSCs). In this work, our aim is to conduct a comparative study on the interface characteristics between the very famous non-fullerene acceptor, ITIC, and a fullerene acceptor, PC71BM by combining molecular dynamics simulations with density functional theory. Based on some typical interface models of the acceptor ITIC or PC71BM and the donor PBDB-T selected from MD simulation, besides the evaluation of charge separation/recombination rates, the relative positions of Frenkel exciton (FE) states and the charge transfer states along with their oscillator strengths are also employed to estimate the charge separation abilities...
November 16, 2017: Physical Chemistry Chemical Physics: PCCP
Riccardo Milan, Gurpreet Singh Selopal, Marco Cavazzini, Simonetta Orlandi, Rita Boaretto, Stefano Caramori, Isabella Concina, Gianluca Pozzi
Computational studies have suggested that the integration of secondary amine as donor groups in the structure of unsymmetrical zinc phthalocyanine (ZnPc) should have positive effects on photovoltaic performance, once the molecule is integrated as light harvester in dye sensitized solar cells (DSSCs). Aiming at obtaining experimental confirmation, we synthesized a peripherally substituted push-pull ZnPc bearing three electron donating diphenylamine substituents and a carboxylic acid anchoring group and integrated it as sensitizer in TiO2-based DSSCs...
November 15, 2017: Scientific Reports
Mariana Cecilio de Oliveira Monteiro, Patrik Schmuki, Manuela Sonja Killian
The effect of different post-treatments on TiO2 anatase surface reactivity was investigated, in order to obtain the best techniques for enhancing anatase performance in diverse applications, e.g. in photocatalysis and especially as photoelectrodes for dye-sensitized solar cells (DSSCs). Different post-treatments of compact anodic anatase TiO2 were compared, including O2 plasma, UV irradiation, immersion in H2O2, vapor thermal treatment and post-anodization, evaluating the increase of the amount of OH reactive groups on the surface and removal of surface contamination...
November 15, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
Dong Han, Cuncun Wu, Yunbiao Zhao, Yi Chen, Lixin Xiao, Ziqiang Zhao
In recent years, perovskite solar cells have drawn widespread attention. As an electrode material, fluorine-doped tin oxide (FTO) is widely used in various kinds of solar cells. However, the relatively low work function (WF) (~4.6 eV) limits its application. The potential barrier between the transparent conductive oxide (TCO) electrode and the hole transport layer (HTL) in inverted perovskite solar cells results in device performance decrease. In this paper, we propose a method to adjust WF of FTO by implanting zirconium ions into the FTO surface...
November 15, 2017: ACS Applied Materials & Interfaces
Suman, Anirban Bagui, Ram Datt, Vinay Gupta, Surya Prakash Singh
A small molecule non-fullerene acceptor based on a fluorene core having a furan π-spacer and end capped with rhodanine (FRd2) is developed for solution processable bulk heterojunction organic solar cells (OSCs). The simplistic synthetic protocol reduces several reaction steps and hence production cost. Extended π-conjugation via furan units and the presence of electronegative rhodanine groups result in a power conversion efficiency of 9.4% in OSCs, which is the highest so far among these categories of molecules...
November 15, 2017: Chemical Communications: Chem Comm
Zihang Song, Guoqing Tong, Huan Li, Guopeng Li, Shuai Ma, Shimeng Yu, Qian Liu, Yang Jiang
Three-dimensional (3-D) architecture perovskite solar cells (PSCs) using CdS nanorod arrays as electron transport layer were designed and prepared by layer-by-layer via a physical-chemical vapor deposition process (P-CVD). The CdS NRs not only provided a scaffold to perovskite film, but also increased the interfacial contact between the perovskite film and electron transport layer. As an optimized result, a high power conversion efficiency (PCE) of 12.46% with a short-circuit current density (Jsc) of 19.88 mA cm-2, an open-circuit voltage (Voc) of 1...
November 15, 2017: Nanotechnology
Igor B Rogozin, Alexander Goncearenco, Artem G Lada, Subhajyoti De, German Nudelman, Anna R Panchenko, David N Cooper, Youri I Pavlov
DNA polymerase (pol) η is a specialized error-prone polymerase with at least two quite different and contrasting cellular roles: to mitigate the genetic consequences of solar UV irradiation, and promote somatic hypermutation in the variable regions of immunoglobulin genes. Misregulation and mistargeting of pol η can compromise genome integrity. We explored whether the mutational signature of pol η could be found in datasets of human somatic mutations derived from normal and cancer cells. A substantial excess of single and tandem somatic mutations within known pol η mutable motifs was noted in skin cancer as well as in many other types of human cancer, suggesting that somatic mutations in A:T bases generated by DNA polymerase η are a common feature of tumorigenesis...
November 15, 2017: Cell Cycle
Shuai You, Shiqing Bi, Jing Huang, Qiushuang Jia, Yuhe Yuan, Yanjie Xia, Zhenyu Xiao, Zhuzhu Sun, Jiangfeng Liu, Shujie Sun, Zhiqiang Zhao
To reduce intrinsic defect density in perovskite films, various additives are often added into the precursor solution. In this paper, a novel solution approach where isopropanol (IPA) was added into the precursor solution was developed for the preparation of normal planar perovskite solar cells (PSCs). A champion power conversion efficiency (PCE) of 19.70% was achieved with this approach. By adding IPA into the precursor solution, CH3NH3PbI3 perovskite showed better crystallization and stability, indicating improved film quality...
November 14, 2017: Chemistry: a European Journal
Haiyuan Xu, Sihua Zhong, Yufeng Zhuang, Wenzhong Shen
Nanoscale inverted pyramid structures (NIPs) have always been regarded as one of the most paramount light management schemes to achieve the extraordinary performance in various devices, especially in solar cells, due to their outstanding antireflection ability with relative lower surface enhancement ratio. However, the current approaches to fabricating the NIPs are complicated and not cost-effective for the massive cell production in the photovoltaic industry. Here, controllable NIPs are fabricated on crystalline silicon (c-Si) wafers by Ag catalyzed chemical etching and alkaline modification, which is a preferable all-solution-processed method...
November 14, 2017: Nanotechnology
Qiqi He, Kai Yao, Xiaofeng Wang, Xuefeng Xia, Shifeng Leng, Fan Li
Flexible perovskite solar cells (PeSCs) using plastic substrates have become one of the most attractive points in the field of thin film solar cells. Low-temperature and solution-processable nanoparticles enable the fabrication of semiconductor thin films in a simple and low cost approach to function as charge-selective layers in flexible PeSCs. Here, we synthesized phase-pure p-type Cu-doped NiOx nanoparticles (NPs) with good electrical properties, which can be processed to smooth, pinhole-free and efficient hole transport layers (HTLs) with large-area uniformity over a wide range of film thickness using the room-temperature solution-processing technique...
November 14, 2017: ACS Applied Materials & Interfaces
Yong-Jin Noh, Yu-Jin Choi, Ji-Ho Jeong, Seok-Soon Kim, Kwang-Un Jeong, Seok-In Na
We present an efficient and stable interfacial material based on a water-soluble perylene diimide derivative functionalized with ionic and methacrylate groups (abbreviated as PDIM), which can be stabilized by the photo-polymerization of diacrylate groups at both ends of the side chain in the PDIM. The characteristics of the photo-cross-linked PDIM films were examined using absorption spectra, cyclic voltammetry, work function, and surface morphology. The feasibility of the photo-cross-linked PDIM films as a novel electron transporting layer (ETL) in polymer solar cells (PSCs) was also investigated...
November 14, 2017: Nanoscale
Jin Hyuck Heo, Min Hyuk Jang, Min Ho Lee, Dong Hee Shin, Do Hun Kim, Sang Hwa Moon, Sang-Wook Kim, Bum Jun Park, Sang Hyuk Im
High performance solid-state PbS quantum dot-sensitized solar cells (QD-SSCs) with stable 9.2 % power conversion efficiency at 1 Sun condition are demonstrated by introduction of hybrid perovskite inter-layer. The PbS QDs formed on mesoscopic TiO¬¬2 (mp-TiO2) by spin-assisted successive precipitation and anionic exchange reaction method do not exhibit PbSO4 but have PbSO3 oxidation species. By introducing perovskite inter-layer in between mp-TiO2/PbS QDs and poly-3-hexylthiophene, the PbSO3 oxidation species are fully removed in the PbS QDs and thereby the efficiency of PbS QD-SSCs is enhanced over 90 % compared to the pristine PbS QD-SSCs...
November 14, 2017: ACS Applied Materials & Interfaces
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