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https://www.readbyqxmd.com/read/28335319/influence-of-quantum-dot-concentration-on-carrier-transport-in-zno-tio%C3%A2-nano-hybrid-photoanodes-for-quantum-dot-sensitized-solar-cells
#1
Francis S Maloney, Uma Poudyal, Weimin Chen, Wenyong Wang
Zinc oxide nanowire and titanium dioxide nanoparticle (ZnO:TiO₂ NW/NP) hybrid films were utilized as the photoanode layer in quantum dot-sensitized solar cells (QDSSCs). CdSe quantum dots (QDs) with a ZnS passivation layer were deposited on the ZnO:TiO₂ NW/NP layer as a photosensitizer by successive ion layer adsorption and reaction (SILAR). Cells were fabricated using a solid-state polymer electrolyte and intensity-modulated photovoltage and photocurrent spectroscopy (IMVS/PS) was carried out to study the electron transport properties of the cell...
October 25, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28335285/graphene-and-carbon-quantum-dot-based-materials-in-photovoltaic-devices-from-synthesis-to-applications
#2
REVIEW
Sofia Paulo, Emilio Palomares, Eugenia Martinez-Ferrero
Graphene and carbon quantum dots have extraordinary optical and electrical features because of their quantum confinement properties. This makes them attractive materials for applications in photovoltaic devices (PV). Their versatility has led to their being used as light harvesting materials or selective contacts, either for holes or electrons, in silicon quantum dot, polymer or dye-sensitized solar cells. In this review, we summarize the most common uses of both types of semiconducting materials and highlight the significant advances made in recent years due to the influence that synthetic materials have on final performance...
August 25, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28335243/correlation-between-cdse-qd-synthesis-post-synthetic-treatment-and-bhj-hybrid-solar-cell-performance
#3
Michael Eck, Michael Krueger
In this publication we show that the procedure to synthesize nanocrystals and the post-synthetic nanocrystal ligand sphere treatment have a great influence not only on the immediate performance of hybrid bulk heterojunction solar cells, but also on their thermal, long-term, and air stability. We herein demonstrate this for the particular case of spherical CdSe nanocrystals, post-synthetically treated with a hexanoic acid based treatment. We observe an influence from the duration of this post-synthetic treatment on the nanocrystal ligand sphere size, and also on the solar cell performance...
June 14, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28333391/high-performance-nonfullerene-polymer-solar-cells-based-on-imide-functionalized-wide-bandgap-polymers
#4
Baobing Fan, Kai Zhang, Xiao-Fang Jiang, Lei Ying, Fei Huang, Yong Cao
High-performance nonfullerene polymer solar cells (PSCs) are developed by integrating the nonfullerene electron-accepting material 3,9-bis(2-methylene-(3-(1,1-dicyanomethylene)-indanone))-5,5,11,11-tetrakis(4-hexylphenyl)-dithieno[2,3-d:2',3'-d']-s-indaceno[1,2-b:5,6-b']dithiophne) (ITIC) with a wide-bandgap electron-donating polymer PTzBI or PTzBI-DT, which consists of an imide functionalized benzotriazole (TzBI) building block. Detailed investigations reveal that the extension of conjugation can affect the optical and electronic properties, molecular aggregation properties, charge separation in the bulk-heterojunction films, and thus the overall photovoltaic performances...
March 23, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28332402/small-molecule-polymer-composite-hole-transporting-layer-for-highly-efficient-and-stable-perovskite-solar-cells
#5
Jinmiao Wang, Zhao-Kui Wang, Meng Li, Ke-Hao Hu, Yingguo Yang, Yun Hu, Xingyu Gao, Liang-Sheng Liao
Effective and stable hole-transporting materials (HTMs) are necessary for obtaining excellent planar perovskite solar cells (PSCs). Herein, we reported a solution-processed composite HTM consisting of a polymer ploy(3,4-ethylene-dioxythiophene):ploystyrenesulfonate (PEDOT:PSS) and a small molecule copper phthalocyanine-3,4',4'',4'''-tetra-sulfonated acid tetra sodium salt (TS-CuPc) with optimized doping ratios. The composite HTM is crucial on account of not only enhancing the hole transport and extraction, but also improving the perovskite crystallization...
March 23, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28332393/amino-silane-as-a-molecular-linker-between-electron-transport-layer-and-active-layer-for-the-efficient-inverted-polymer-solar-cells
#6
Ping Fu, Xin Guo, Shengyang Wang, Yun Ye, Can Li
We presented an amino-silane as a molecular linker between ZnO electron transport layer and fullerene-based active layer for efficient inverted polymer solar cells. An enhanced power conversion efficiency (PCE) was obtained from 8.47% to 9.46% based on PTB7-Th as donors. The amino-silane molecular linker provides dual functionalities for enhanced PCE, including 1) passivating ZnO surface and decreasing the surface work function of ZnO for energy level alignment; 2) bonding onto the fullerene-based active layer to reduce the interface contact resistance...
March 23, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28322055/a-statistical-paradigm-for-organic-optoelectronic-devices-normal-force-testing-for-adhesion-of-opvs-and-oleds
#7
Lindsay Vasilak, Silvie M Tanu Halim, Hrishikesh Das Gupta, Juan Yang, Marleen Kamperman, Ayse Turak
In this study, we assess the utility of a normal force (pull-test) approach to measuring adhesion in organic solar cells and organic light emitting diodes. This approach is a simple and practical method of monitoring the impact of systematic changes in materials, processing conditions, or environmental exposure on interfacial strength and electrode delamination. The ease of measurement enables a statistical description with numerous samples, variant geometry, and minimal preparation. After examining over 70 samples, using the Weibull modulus and the characteristic breaking strength as metrics, we were able to successfully differentiate the adhesion values between Alq3 and P3HT:PCBM interfaces with Al, and between two annealing times for the bulk heterojunction polymer blends...
March 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28322045/9-73-efficiency-nonfullerene-all-organic-small-molecule-solar-cells-with-absorption-complementary-donor-and-acceptor
#8
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/28317382/effects-on-photovoltaic-performance-of-dialkyloxy-benzothiadiazole-copolymers-by-varying-the-thienoacene-donor
#9
Gururaj P Kini, Sora Oh, Zaheer Abbas, Shafket Rasool, Muhammad Jahandar, Chang Eun Song, Sang Kyu Lee, Won Suk Shin, Won-Wook So, Jong-Cheol Lee
A series of four donor-acceptor alternating copolymers based on dialkyloxy-benzothiadiazole (ROBT) as an acceptor and thienoacenes as a donor units were synthesized and tested for polymer solar cells (PSCs). These new polymers had different donor units with varied electron-donating ability (thieno[3,2-b]thiophene (TT), dithieno[3,2-b:2',3'-d]thiophene (DTT), benzo[1,2-b:4,5-b']dithiophene (BDT) and naphtha[1,2-b:5,6-b']dithiophene (NDT)) in the polymer backbone. To understand the effect of these thienoacenes on the optoelectronic and photovoltaic properties of the copolymers, we systematically analyzed and compared energy levels, crystallinity, morphology, charge recombination and charge carrier mobility in the resulting polymers...
March 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28298084/small-molecule-acceptor-based-on-the-heptacyclic-benzodi-cyclopentadithiophene-unit-for-highly-efficient-nonfullerene-organic-solar-cells
#10
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/28295734/single-junction-binary-blend-nonfullerene-polymer-solar-cells-with-12-1-efficiency
#11
Fuwen Zhao, Shuixing Dai, Yang Wu, Qianqian Zhang, Jiayu Wang, Li Jiang, Qidan Ling, Zhixiang Wei, Wei Ma, Wei You, Chunru Wang, Xiaowei Zhan
A new fluorinated nonfullerene acceptor, ITIC-Th1, has been designed and synthesized by introducing fluorine (F) atoms onto the end-capping group 1,1-dicyanomethylene-3-indanone (IC). On the one hand, incorporation of F would improve intramolecular interaction, enhance the push-pull effect between the donor unit indacenodithieno[3,2-b]thiophene and the acceptor unit IC due to electron-withdrawing effect of F, and finally adjust energy levels and reduce bandgap, which is beneficial to light harvesting and enhancing short-circuit current density (JSC )...
March 10, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28287699/efficient-polymer-solar-cells-with-high-open-circuit-voltage-containing-diketopyrrolopyrrole-based-non-fullerene-acceptor-core-end-capped-with-rhodanine-units
#12
María Privado, Virginia Cuesta, Pilar de la Cruz, Mukhamed L Keshtov, Rahul Singhal, Ganesh D Sharmad, Fernando Langa
Herein we report the synthesis of a novel A-D-A-D-A non-fullerene small-molecule acceptor (NFSMA) bearing a diketopyrrolopyrrole (DPP) acceptor central core coupled to terminal rhodanine acceptors via a thiophene donor linker (denoted as MPU1) for use in non-fullerene polymer solar cells (PSCs). This NFSMA exhibits a narrow optical band gap (1.48 eV), strong absorption in the 600-800 nm wavelength region of the solar spectrum, and a lowest unoccupied energy level of -3.99 eV. When the mixture of a medium band gap D-A copolymer P (1...
March 23, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28282117/metal-selenides-as-efficient-counter-electrodes-for-dye-sensitized-solar-cells
#13
Zhitong Jin, Meirong Zhang, Min Wang, Chuanqi Feng, Zhong-Sheng Wang
Solar energy is the most abundant renewable energy available to the earth and can meet the energy needs of humankind, but efficient conversion of solar energy to electricity is an urgent issue of scientific research. As the third-generation photovoltaic technology, dye-sensitized solar cells (DSSCs) have gained great attention since the landmark efficiency of ∼7% reported by O'Regan and Grätzel. The most attractive features of DSSCs include low cost, simple manufacturing processes, medium-purity materials, and theoretically high power conversion efficiencies...
March 10, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28282096/bithienopyrroledione-vs-thienopyrroledione-based-copolymers-dramatic-increase-of-power-conversion-efficiency-in-bulk-heterojunction-solar-cells
#14
Xiaolan Qiao, Weichao Chen, Qinghe Wu, Shiqian Zhang, Hongzhuo Wu, Zhiqiang Liu, Renqiang Yang, Hongxiang Li
Bithienopyrroledione (bi-TPD) based polymers P1 and P2 are designed and synthesized. Photovoltaic devices based on P1:PC71BM and P2:PC71BM blend films show power conversion efficiencies (PCEs) of 8.22% and 9.08%, respectively, whereas devices based on their thienopyrroledione (TPD)-based analogue P3 and PC71BM blend films display a PCE of 5.10%.
March 10, 2017: Chemical Communications: Chem Comm
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
#15
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/28265617/non-fullerene-organic-solar-cells-based-on-diketopyrrolopyrrole-polymers-as-electron-donors-and-itic-as-an-electron-acceptor
#16
Xudong Jiang, Yunhua Xu, Xiaohui Wang, Yang Wu, Guitao Feng, Cheng Li, Wei Ma, Weiwei Li
In this work, we provide systematic studies on the non-fullerene solar cells based on diketopyrrolopyrrole (DPP) polymers as electron donors and a well-known electron acceptor ITIC. ITIC has been widely reported in non-fullerene solar cells with high power conversion efficiencies (PCEs) above 10%, when it is combined with a wide band gap conjugated polymer, while its application in small band gap DPP polymers has never been reported. Herein, we select four DPP polymers containing different thienyl linkers, resulting in distinct absorption spectra, energy levels and crystalline properties...
March 7, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28263058/suppression-of-thermally-induced-fullerene-aggregation-in-poly-fullerene-based-multi-acceptor-organic-solar-cells
#17
Simon A Dowland, Michael Salvador, Jose Dario Perea, Nicola Gasparini, Stefan Langner, Sambatra Rajoelson, Hasina Harimino Ramanitra, Benjamin D Lindner, Andres Osvet, Christoph J Brabec, Roger C Hiorns, Hans-Joachim Egelhaaf
A novel main-chain poly(fullerene) poly{(fullerene)-alt-[2,5-bis(octyloxy)terephthalaldehyde]} (PPC4) is investigated for its hypothesized superior morphological stability as an electron accepting material in organic photovoltaics relative to the widely used fullerene phenyl-C61-butyric acid methyl ester (PCBM). When mixed with poly(3-hexylthiophene-2,5-diyl) (P3HT) PPC4 affords low charge generation yields due to poor intermixing within the blend. The adoption of a multi-acceptor system, by introducing PCBM into the P3HT:poly(fullerene) blend, was found to lead to a threefold enhancement in charge generation, affording power conversion efficiencies very close to the prototypical P3HT:PCBM binary control...
March 6, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28261734/naphthalene-diimide-difluorobenzene-based-polymer-acceptors-for-all-polymer-solar-cells
#18
Ping Deng, Carr Hoi Yi Ho, Yong Lu, Ho-Wa Li, Sai-Wing Tsang, Shu Kong So, Beng S Ong
Regio-random (P1) and -regular (P2) difluorobenzene-naphthalene-containing polymer acceptors were developed for bulk-heterojunction all-polymer solar cells (all-PSCs). P2 exhibited significantly higher crystallinity in thin films, providing high spectral absorptivity and electron mobility than P1. When used in all-PSC devices, P2 afforded a respectably higher power conversion efficiency of over 5%.
March 18, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28256788/a-green-route-to-conjugated-polyelectrolyte-interlayers-for-high-performance-solar-cells
#19
Jegadesan Subbiah, Valerie D Mitchell, Nicholas K C Hui, David J Jones, Wallace W H Wong
Synthesis of fluorene-based conjugated polyelectrolytes was achieved via Suzuki polycondensation in water and completely open to air. The polyelectrolytes were conveniently purified by dialysis and analysis of the materials showed properties expected for fluorene-based conjugated polyelectrolytes. The materials were then employed in solar cell devices as an interlayer in conjunction with ZnO. The double interlayer led to enhanced power conversion efficiency of 10.75 % and 15.1 % for polymer and perovskite solar cells, respectively...
March 3, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28256770/the-light-induced-field-effect-solar-cell-concept-perovskite-nanoparticle-coating-introduces-polarization-enhancing-silicon-cell-efficiency
#20
Yusheng Wang, Zhouhui Xia, Lijia Liu, Weidong Xu, Zhongcheng Yuan, Yupeng Zhang, Henning Sirringhaus, Yeshayahu Lifshitz, Shui-Tong Lee, Qiaoliang Bao, Baoquan Sun
Solar cell generates electrical energy from light one via pulling excited carrier away under built-in asymmetry. Doped semiconductor with antireflection layer is general strategy to achieve this including crystalline silicon (c-Si) solar cell. However, loss of extra energy beyond band gap and light reflection in particular wavelength range is known to hinder the efficiency of c-Si cell. Here, it is found that part of short wavelength sunlight can be converted into polarization electrical field, which strengthens asymmetry in organic-c-Si heterojunction solar cell through molecule alignment process...
March 3, 2017: Advanced Materials
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