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Solar photovoltaic

Brenda Vargas, Estrella Ramos, Enrique Pérez-Gutiérrez, Juan C Alonso, Diego Solis-Ibarra
Since the establishment of perovskite solar cells (PSCs) there has been an intense search for alternative materials to replace lead and improve their stability towards moisture and light. As single-metal perovskite structures have yielded unsatisfactory performances, an alternative is the use of double perovskites that incorporate a combination of metals. To this day, only a handful of these compounds have been synthesized, but most of them have indirect bandgaps and/or do not have bandgaps energies well-suited for photovoltaic applications...
June 21, 2017: Journal of the American Chemical Society
Fatemeh Behrouznejad, Cheng-Min Tsai, Sudhakar Narra, Eric W-G Diau, Nima Taghavinia
Solar cells with high-efficiency, low-cost and high-stability are the target for the new generation of solar cells. A fully printable perovskite (CH3NH3PbI3) solar cell (PSC) with device architecture FTO/TiO2/Al2O3/NiOx/C is fabricated in the current research as a low-cost and relatively stable structure and is investigated to determine how different fabrication factors such as the thickness of the insulating spacer layer (Al2O3) or treatments such as heat and UV-O3 treatments can affect the interfacial properties of this multi-layer mesoporous structure...
June 20, 2017: ACS Applied Materials & Interfaces
Sheng Dong, Zhicheng Hu, Kai Zhang, Qingwu Yin, Xiaofang Jiang, Fei Huang, Yong Cao
A cross-linkable dual functional polymer hybrid electron transport layer (ETL) is developed by simply adding an amino-functionalized polymer dopant (PN4N) and a light crosslinker into a commercialized n-type semiconductor (N2200) matrix. It is found that the resulting hybrid ETL not only has a good solvent resistance, facilitating multilayers device fabrication but also exhibits much improved electron transporting/extraction properties due to the doping between PN4N and N2200. As a result, by using PTB7-Th:PC71 BM blend as an active layer, the inverted device based on the hybrid ETL can yield a prominent power conversion efficiency of around 10...
June 20, 2017: Advanced Materials
Giulia Grancini, Daniele Viola, Yonghui Lee, Michael Saliba, Sanghyun Paek, Kyung Taek Cho, Simonetta Orlandi, Marco Cavazzini, Fernando Fungo, Mohammad I Hossain, Abdelhak Belaidi, Nouar Tabet, Gianluca Pozzi, Giulio Cerullo, Mohammad Khaja Khaja Nazeeruddin
With power conversion efficiency (PCE) exceeding 22%, perovskite solar cells (PSCs) have thrilled the photovoltaic research. However, interface behavior is still not understood and a hot subject of research: different processes occur over a hierarchy of timescales, from femtoseconds to seconds, making the perovskite interface physics intriguing. Here, by femtosecond transient absorption spectroscopy with spectral coverage extended to the crucial IR region, we interrogate the ultrafast interface- specific processes at standard as well as newly molecularly-engineered perovskite interfaces used in state of the art PSCs...
June 19, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
M D Grima Murcia, Francisco Sánchez Ferrer, Jennifer Sorinas, J M Ferrandez, Eduardo Fernandez
Much is currently being studied on the negative visual impact associated to the installation of large wind turbines or photovoltaic farms. However, methodologies for quantitatively assessing landscape impact are scarce. In this work we used electroencephalographic (EEG) recordings to investigate the brain activity of 14 human volunteers when looking at the same landscapes with and without wind turbines, solar panels and nuclear power plants. Our results showed no significant differences for landscapes with solar power systems or without them, and the same happened for wind turbines, what was in agreement with their subjective scores...
June 13, 2017: Journal of Environmental Management
Wenran Wang, Guocan Jiang, Juan Yu, Wei Wang, Zhenxiao Pan, Naoki Nakazawa, Qing Shen, Xinhua Zhong
Unambiguously direct adsorption (DA) of initial oil-soluble QDs on TiO2 film electrode is a convenient and simple approach in the construction of quantum dot sensitized solar cells (QDSCs). Regrettably, low QD loading amount and poor reproducibility shadow the advantages of DA route and constrain its practical application. Herein, the influence of experimental variables in DA process on QD loading amount as well as on the photovoltaic performance of the resultant QDSCs were investigated and optimized systematically, including the choice of solvent, purification of QDs, sensitization time, as well as QD concentration...
June 16, 2017: ACS Applied Materials & Interfaces
Tanja Ivanovska, Chiara Dionigi, Edoardo Mosconi, Filippo De Angelis, Fabiola Liscio, Vittorio Morandi, Giampiero Ruani
Charge carriers' long diffusion length in the CH3NH3PbI3 perovskite is one of the most relevant properties for explaining the high photovoltaic efficiency of perovskites solar cells. As possible mechanism for the large diffusion length of electrons and holes, several authors suggested a reduced coulomb attraction of the carriers due to the formation of polarons. Here we performed continuous wave far infrared photoinduced absorption (PIA) experiments on CH3NH3PbI3; spectral changes are associated to local deformation of the lattice around the photogenerated long lived charges, a typical signature of photo-induced polarons...
June 16, 2017: Journal of Physical Chemistry Letters
He Tang, Shengsheng He, Chuangwei Peng
Faced with the increasingly serious energy and environmental crisis in the world nowadays, the development of renewable energy has attracted increasingly more attention of all countries. Solar energy as an abundant and cheap energy is one of the most promising renewable energy sources. While high-performance solar cells have been well developed in the last couple of decades, the high module cost largely hinders wide deployment of photovoltaic devices. In the last 10 years, this urgent demand for cost-effective solar cells greatly facilitates the research of solar cells...
December 2017: Nanoscale Research Letters
Zhiyong Liu, Yan Zhong, Bo Sun, Xingyue Liu, Jinghui Han, Tielin Shi, Zirong Tang, Guanglan Liao
Power packs integrating both photovoltaic parts and energy storage parts have gained great scientific and technological attention due to the increasing demand for green energy and the tendency for miniaturization and multi-functionalization in electronics industry. In this study we demonstrate novel integration of perovskite solar cell and solid-state supercapacitor for power packs. Perovskite solar cell is integrated with the supercapacitor based on the common carbon electrodes to hybridize photoelectric conversion and energy storage...
June 14, 2017: ACS Applied Materials & Interfaces
Like Huang, Xiaoxiang Sun, Chang Li, Jie Xu, Rui Xu, Yangyang Du, Jian Ni, Hongkun Cai, Juan Li, Ziyang Hu, Jianjun Zhang
Recently, low-temperature solution-processed tin oxide (SnO2) as versatile electron transport layer (ETL) for efficient and robust planar heterojunction (PH) perovskite solar cells (PSCs) has attracted particular attention due to its outstanding properties such as high optical transparency, high electron mobility, and suitable band alignment. However, for most of the reported works, an annealing temperature of 180 °C is generally required. This temperature can reluctantly said to be a low temperature, especially with respect to the flexible application where 180 °C is still a little too high that PET flexible substrate cannot bear...
June 14, 2017: ACS Applied Materials & Interfaces
Palraj Ranganathan, Ragu Sasikumar, Shen-Ming Chen, Syang-Peng Rwei, Pedaballi Sireesha
We applied the nitrogen-doped graphene@nickel oxide (NGE/NiO) nanocomposite doped TiO2 as a photo-anode for dye-sensitized solar cells (DSSCs) on fluorine-doped tin oxide (FTO) substrates by screen printing method. Power conversion efficiency (PCE) of 9.75% was achieved for this DSSCs device, which is greater than that of DSSCs devices using GO/TiO2, and NiO/TiO2 based photo-anodes (PCE=8.55, and 9.11%). Also, the fill factor (FF) of the DSSCs devices using the NGE/NiO/TiO2 nanocomposite photo-anode was better than that of other photo-anodes...
June 10, 2017: Journal of Colloid and Interface Science
Jae Keun Nam, Myung Sun Jung, Sung Uk Chai, Yung Ji Choi, Dongho Kim, Jong Hyeok Park
Thermal instability of organic-inorganic hybrid perovskites will be an inevitable hurdle for commercialization. Recently, all-inorganic cesium lead halide perovskites, in particular, CsPbI2Br, have emerged as thermally stable and efficient photovoltaic light absorbers. However, the fundamental properties of this material have not been studied in detail. The crystal formation behavior of CsPbI2Br is investigated by examining the surface morphology, crystal structure, and chemical state of the perovskite films...
June 14, 2017: Journal of Physical Chemistry Letters
Chunyu Liu, Dezhong Zhang, Zhiqi Li, Xinyuan Zhang, Wenbin Guo, Liu Zhang, Shengping Ruan, Yongbing Long
To overcome drawbacks of the electron transport layer, such as complex surface defects and unmatched energy levels, we successfully employed a smart semiconductor-metal interfacial nanojunciton in organic solar cells by evaporating an ultrathin Al interlayer onto annealing-free ZnO electron transport layer, resulting in a high fill factor of 73.68% and power conversion efficiency of 9.81%. The construction of ZnO-Al nanojunction could effectively fill the surface defects of ZnO and reduce its work function because of the electron transfer from Al to ZnO by Fermi level equilibrium...
June 21, 2017: ACS Applied Materials & Interfaces
Moustafa El Kass, Brohan Luc, Nicolas Gautier, Solène Béchu, Céline David, Noëlla Lemaitre, Solenn Berson, M Richard-Plouet
Using reflux method with [Ti8O12(H2O)24]Cl8.HCl.7H2O as titanium precursor at 120°C for 24h leads to produce a transparent colloidal solution of nanosized crystallised anatase TiO2. The adjustment of the particle size and composition of the dispersant is monitored through the initial water content while controlling the conversion of propylene carbonate into propylene glycol occuring during reflux. The solutions were processed as thin films in order to produce electron transporting layers in hybrid bulk heterojunction solar cells, using a blend of P3HT-PCBM polymers as absorbers, in inverted architecture...
June 12, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
Zhifang Shi, Yi Zhang, Chao Cui, Binghan Li, Wenjia Zhou, Zhijun Ning, Qixi Mi
Semiconducting lead triiodide perovskites (APbI3 ) have shown remarkable performance in applications including photovoltaics and electroluminescence. Despite many theoretical possibilities for A(+) in APbI3 , the current experimental knowledge is largely limited to two of these materials: methylammonium (MA(+) ) and formamidinium (FA(+) ) lead triiodides, neither of which adopts the ideal, cubic perovskite structure at room temperature. Here, a volume-based criterion is proposed for cubic APbI3 to be stable, and two perovskite materials MA1-x EAx PbI3 (MEPI, EA(+) = ethylammonium) and MA1-y DMAy PbI3 (MDPI, DMA(+) = dimethylammonium) are introduced...
June 12, 2017: Advanced Materials
Enbing Bi, Han Chen, Fengxian Xie, Yongzhen Wu, Wei Chen, Yanjie Su, Ashraful Islam, Michael Grätzel, Xudong Yang, Liyuan Han
Long-term stability is crucial for the future application of perovskite solar cells, a promising low-cost photovoltaic technology that has rapidly advanced in the recent years. Here, we designed a nanostructured carbon layer to suppress the diffusion of ions/molecules within perovskite solar cells, an important degradation process in the device. Furthermore, this nanocarbon layer benefited the diffusion of electron charge carriers to enable a high-energy conversion efficiency. Finally, the efficiency on a perovskite solar cell with an aperture area of 1...
June 12, 2017: Nature Communications
Jie Zhang, Yinan Zhang, Tao Song, Xinlei Shen, Xuegong Yu, Shuit-Tong Lee, Baoquan Sun, Baohua Jia
Organic-inorganic hybrid solar cells based on n-type crystalline silicon and poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) exhibited promising efficiency along with low-cost fabrication process. In this work, ultra-thin flexible silicon substrates with a thickness down to tens of micrometers were employed to fabricate hybrid solar cells to reduce the usage of silicon materials. In order to improve light trapping ability, nanostructures were built-up on the thin silicon substrates by metal assisted chemical etching method...
June 12, 2017: ACS Applied Materials & Interfaces
Yiming Cao, Yasemin Saygili, Amita Ummadisingu, Joël Teuscher, Jingshan Luo, Norman Pellet, Fabrizio Giordano, Shaik Mohammed Zakeeruddin, Jacques-E Moser, Marina Freitag, Anders Hagfeldt, Michael Grätzel
Solid-state dye-sensitized solar cells currently suffer from issues such as inadequate nanopore filling, low conductivity and crystallization of hole-transport materials infiltrated in the mesoscopic TiO2 scaffolds, leading to low performances. Here we report a record 11% stable solid-state dye-sensitized solar cell under standard air mass 1.5 global using a hole-transport material composed of a blend of [Cu (4,4',6,6'-tetramethyl-2,2'-bipyridine)2](bis(trifluoromethylsulfonyl)imide)2 and [Cu (4,4',6,6'-tetramethyl-2,2'-bipyridine)2](bis(trifluoromethylsulfonyl)imide)...
June 9, 2017: Nature Communications
Inchan Hwang, Deokjae Choi, Sojeong Lee, Ji Hoon Seo, Ka-Hyun Kim, Ilsun Yoon, Kwanyong Seo
We designed and fabricated a random-size inverted-pyramid-structured polydimethylsiloxane (RSIPS-PDMS) sticker to enhance the light absorption of solar cells and thus increase their efficiency. The fabricated sticker was laminated onto bare glass and crystalline silicon (c-Si) surfaces; consequently, low solar-weighted reflectance values were obtained for these surfaces (6.88 and 17.2%, respectively). In addition, we found that incident light was refracted at the PDMS-air interface of each RSIPS, which redirected the incident power and significantly increased the optical path length in the RSIPS-PDMS sticker which was 14...
June 16, 2017: ACS Applied Materials & Interfaces
Ras Baizureen Roseli, Patrick C Tapping, Tak W Kee
The excited states of conjugated polymers play a central role in their applications in organic solar photovoltaics. The delocalized excited states of conjugated polymers are short-lived (τ < 40 fs) but are imperative in the photovoltaic properties of these materials. Photoexcitation of poly(3-hexylthiophene) (P3HT) induces an excited-state absorption band, but the transitions that are involved are not well understood. In this work, calculations have been performed on P3HT analogues using nonlinear response time-dependent density functional theory to show that an increase in the oligomer length correlates with the dominance of the S1 → S3 transition...
June 9, 2017: Journal of Physical Chemistry Letters
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