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Solar photovoltaic

Peng Xu, Peng Liu, Yuanyuan Li, Bo Xu, Lars Kloo, Licheng Sun, Yong Hua
Two D-A-D structured hole-transport materials (YN1 and YN2) have been synthesized and used in perovskite solar cells. The two HTMs have low-lying HOMO levels and impressive mobility. PSCs fabricated with YN2 showed a PCE value of 19.27% in ambient air, which is significantly higher than that of Spiro-OMeTAD (17.80%). PSCs based on YN1 showed an inferior PCE of 16.03%. We found that the incorporation of the stronger electron-withdrawing group in the HTM YN2 improves the PCE of PSCs. Furthermore, the YN2-based PSCs exhibit good long-term stability retaining 91...
May 22, 2018: ACS Applied Materials & Interfaces
Yi-Jiun Huang, Hsiu-Cheng Chen, Hsi-Kuei Lin, Kung-Hwa Wei
In this study, we incorporated molybdenum disulfide (MoS2) nanosheets into sol-gel processing of zinc oxide (ZnO) to form ZnO:MoS2 composites for use as electron transport layers (ETLs) in inverted polymer solar cells featuring a binary bulk heterojunction active layer. We could effectively tune the energy band of the ZnO:MoS2 composite film from 4.45 to 4.22eV by varying the content of MoS2 up to 0.5 wt%, such that the composite was suitable for use in bulk heterojunction photovoltaic devices based on poly[bis(5-(2-ethylhexyl)thien-2-yl)benzodithiophene-alt-(4-(2-ethylhexyl)-3-fluorothienothiophene)-2-carboxylate-2,6-diyl)] (PTB7-TH):phenyl-C71-butryric acid methyl ester (PC71BM)...
May 22, 2018: ACS Applied Materials & Interfaces
Wen-Jeng Ho, Bang-Jin You, Jheng-Jie Liu, Wen-Bin Bai, Hong-Jhang Syu, Ching-Fuh Lin
This paper presents a scheme for the enhancement of silicon solar cells in terms of luminescent emission band and photovoltaic performance. The proposed devices are coated with an luminescent down-shifting (LDS) layer comprising three species of europium (Eu)-doped phosphors mixed within a silicate film (SiO₂) using a spin-on film deposition. The three species of phosphor were mixed at ratios of 0.5:1:1.5, 1:1:1, or 1.5:1:0.5 in weight percentage (wt %). The total quantity of Eu-doped phosphors in the silicate solution was fixed at 3 wt %...
May 18, 2018: Materials
Hayato Ouchi, Takahiro Kizaki, Masaki Yamato, Xu Lin, Nagahiro Hoshi, Fabien Silly, Takashi Kajitani, Takanori Fukushima, Ken-Ichi Nakayama, Shiki Yagai
Helical self-assembly of functional π-conjugated molecules offers unique photochemical and electronic properties in the spectroscopic level, but there are only a few examples that demonstrate their positive impact on the optoelectronic device level. Here, we demonstrate that hydrogen-bonded tapelike supramolecular polymers of a barbiturated oligo(alkylthiophene) show notable improvement in their photovoltaic properties upon organizing into helical nanofibers. A tapelike hydrogen-bonded supramolecular array of barbiturated oligo(butylthiophene) molecules was directly visualized by STM at a liquid-solid interface...
April 21, 2018: Chemical Science
Jinlu He, Meng Guo, Run Long
All-inorganic perovskites have attracted intense interest as promising photovoltaic materials due to their excellent performance. Using time domain density functional theory combined with nonadiabatic (NA) molecular dynamics, we demonstrate that a photoinduced localized polaron-like hole greatly delays the nonradiative electron-hole recombination relative to the structure with delocalized free charge of the CsPbBr3 . This is because localized charge carriers diminish overlap between electron and hole wave functions and decrease the NA coupling by a factor of 6...
May 22, 2018: Journal of Physical Chemistry Letters
Xiao Tan, Zhi Tao, Mingxing Yu, Hanxiao Wu, Haiwang Li
Black silicon fabrication and manipulation have been well reported by institutes around the world and are quite useful for solar absorption and photovoltaic conversion. In this study, silicon micro-nano hybrid structures were fabricated, and the morphologies of the hybrid structures were analyzed. This paper studied nanostructures formed on tips, pits and a flat surface using a dry etching method and a wet etching method. In terms of nanostructure morphology, nanostructures etched by the wet etching method (13 μm) were taller than those etched by the dry etching method (1 μm), but the wet etched morphology was less organized...
May 18, 2018: Scientific Reports
Tao Liu, Lijun Huo, Sreelakshmi Chandrabose, Kai Chen, Guangchao Han, Feng Qi, Xiangyi Meng, Dongjun Xie, Wei Ma, Yuanping Yi, Justin M Hodgkiss, Feng Liu, Jing Wang, Chuluo Yang, Yanming Sun
A polymer fibril assembly can dictate the morphology framework, in forming a network structure, which is highly advantageous in bulk heterojunction (BHJ) organic solar cells (OSCs). A fundamental understanding of how to manipulate such a fibril assembly and its influence on the BHJ morphology and device performance is crucially important. Here, a series of donor-acceptor polymers, PBT1-O, PBT1-S, and PBT1-C, is used to systematically investigate the relationship between molecular structure, morphology, and photovoltaic performance...
May 18, 2018: Advanced Materials
Le Zhang, Wei Geng, Chuan-Jia Tong, Xueguang Chen, Tengfei Cao, Mingyang Chen
Methyl-ammonium lead iodide perovskite (CH3 NH3 PbI3 ) has drawn great attention due to its excellent photovoltaic properties. Because of its loosely compacted structure, the structural, electronic and optical properties of CH3 NH3 PbI3 are sensitive to external modulations. Strain effects on CH3 NH3 PbI3 are fully investigated by the first principles calculations. The results indicate that the inorganic framework deforms under compression or stretch and the embedded organic CH3 NH3 + molecules rotate correspondingly...
May 17, 2018: Scientific Reports
Federico Bella, Polyssena Renzi, Carmen Cavallo, Claudio Gerbaldi
Perovskite solar cells have the potential to revolutionize the world of photovoltaics, and their efficiency close to 23% on a lab-scale recently certified this novel technology as the one with the most rapidly raising performance per year in the whole story of solar cells. With the aim of improving stability, reproducibility and spectral properties of the devices, in the last three years the scientific community strongly focused on Cs-doping for hybrid (typically, organolead) perovskites. In parallel, in order to further contrast hygroscopicity and reach thermal stability, research has also been carried out to achieve the development of all-inorganic perovskites based on caesium, the performances of which are actually rapidly increasing...
May 17, 2018: Chemistry: a European Journal
Lijuan Li, Hui Lin, Xiao Kong, Xiaoyang Du, Xinwei Chen, Ling Zhou, Silu Tao, Caijun Zheng, Xiaohong Zhang
Ternary blend systems have been used to enhance the short-circuit current density (JSC) and fill factor (FF) of organic solar cells (OSCs). However, it is still a challenge to find suitable third components that concurrently possess complementary light absorption and well-matched energy levels. Here, a small organic molecule, 4,4'-(9,9-dihexyl-9H-fluorene-2,7-diyl)bis(N,N-bis(4-(pyren-1-yl)phenyl)anili-ne) (DFNPy), which contains a triphenylamine core and bulky pyrene rings, was designed and used to construct ternary blend OSCs...
May 17, 2018: Nanoscale
Wan-Chin Yu, Neethu Sabastian, Wei-Chen Chang, Chi-Yang Tsia, Chun-Min Lin
Mesoporous ZnO films composed of interconnected porous nanoplates were prepared by an electrochemical deposition-pyrolytic conversion approach and constructed into the photoanodes of dyesensitized solar cells (DSSCs). Precursor nanoplates grown on conducting glass substrates were transformed into ZnO porous nanoplates by calcination at 400 °C for 1 h. Correlations between the ZnO film thickness and the electrochemical deposition time were determined in order to prepare ZnO films of various thicknesses and to study the effect of the film thickness on the photovoltaic performance of DSSCs...
January 1, 2018: Journal of Nanoscience and Nanotechnology
Wei Song, Xi Fan, Bingang Xu, Feng Yan, Huiqin Cui, Qiang Wei, Ruixiang Peng, Ling Hong, Jiaming Huang, Ziyi Ge
All-solution-processing at low temperatures is important and desirable for making printed photovoltaic devices and also offers the possibility of a safe and cost-effective fabrication environment for the devices. Herein, an all-solution-processed flexible organic solar cell (OSC) using poly(3,4-ethylenedioxythiophene):poly-(styrenesulfonate) electrodes is reported. The all-solution-processed flexible devices yield the highest power conversion efficiency of 10.12% with high fill factor of over 70%, which is the highest value for metal-oxide-free flexible OSCs reported so far...
May 16, 2018: Advanced Materials
Ailing Tang, Fan Chen, Bo Xiao, Jing Yang, Jianfeng Li, Xiaochen Wang, Erjun Zhou
Devolopment of organic solar cells with high open-circuit voltage ( V OC ) and power conversion efficiency (PCE) simutaniously plays a significant role, but there is no guideline how to choose the suitable photovoltaic material combinations. In our previous work, we developed "the Same-Acceptor-Strategy" (SAS), by utilizing the same electron-accepting segment to construct both polymeric donor and small molecular acceptor. In this study, we further expend SAS to use both the same electron-accepting and electron-donating units to design the material combination...
2018: Frontiers in Chemistry
Sri Kasi Matta, Chunmei Zhang, Yalong Jiao, Anthony O'Mullane, Aijun Du
The properties of bulk compounds required to be suitable for photovoltaic applications, such as excellent visible light absorption, favorable exciton formation, and charge separation are equally essential for two-dimensional (2D) materials. Here, we systematically study 2D group IV-V compounds such as SiAs2 and GeAs2 with regard to their structural, electronic and optical properties using density functional theory (DFT), hybrid functional and Bethe-Salpeter equation (BSE) approaches. We find that the exfoliation of single-layer SiAs2 and GeAs2 is highly feasible and in principle could be carried out experimentally by mechanical cleavage due to the dynamic stability of the compounds, which is inferred by analyzing their vibrational normal mode...
2018: Beilstein Journal of Nanotechnology
Ioannis Deretzis, Emanuele Smecca, Giovanni Mannino, Antonino La Magna, Tsutomu Miyasaka, Alessandra Alberti
Methylammonium lead iodide (CH3 NH3 PbI3 ) is an extensively used perovskite material with a remarkable potential for solar energy conversion. Despite its high photovoltaic efficiency, the material suffers from fast degradation when aging in atmospheric conditions and/or under sunlight. Here we review the principal degradation mechanisms of CH3 NH3 PbI3 , focusing on the thermodynamic, environmental and polymorphic parameters that impact on the stability of the material. A critical analysis of the available data indicates that degradation under ambient conditions is a defect-generation process that is highly localized on surfaces and interfaces, while it is further enhanced above the tetragonal-cubic transition at ∼54 °C...
May 15, 2018: Journal of Physical Chemistry Letters
Soeun Im, Wanjung Kim, Wonseok Cho, Dongguen Shin, Do Hyung Chun, Ryan Rhee, Jung Kyu Kim, Yeonjin Yi, Jong Hyeok Park, Jung Hyun Kim
Even though poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) has been commonly used as a hole extraction layer (HEL) for p-i-n perovskite solar cells (PSCs), the cells' photovoltaic performance deteriorates because of the low and unstable work functions (WFs) of PEDOT:PSS versus those of a perovskite layer. To overcome this drawback, we synthesized a copolymer (P(SS-co-TFPMA)) ionomer consisting of PSS and tetrafluoropropylmethacrylate (TFPMA) as an alternative to conventional PEDOT:PSS. The PEDOT:P(SS-co-TFPMA) copolymer solution and its film exhibited excellent homogeneity and high phase stability compared with a physical mixture of TFPMA with PEDOT:PSS solution...
May 15, 2018: ACS Applied Materials & Interfaces
Ji Hyung Lee, Chang Geun Park, Aesun KIm, Hyung Jong Kim, Youngseo Kim, Sungnam Park, Min Ju Cho, Dong Hoon Choi
We synthesized a novel fully conjugated block copolymer (CBC), P3, in which a wide-bandgap donor block (P1) was connected to a narrow-bandgap acceptor block (P2). As P3 contains P1 block with a wide bandgap and P2 block with a narrow bandgap, it exhibits very wide complementary absorption. Transient photoluminescence (PL) measurement using P3 dilute solution demonstrated intramolecular charge transfer between the P1 block and P2 block, which was not observed in a P1/P2 blend solution. A P3 thin film showed complete PL quenching because the photoinduced inter/intramolecular charge transfer states were effectively formed...
May 15, 2018: ACS Applied Materials & Interfaces
Zhen Yin, Ahmad Dastjerdi, Francois Barthelat
Glasses are optically transparent, hard materials that have been in sustained demand and usage in architectural windows, optical devices, electronics and solar panels. Despite their outstanding optical qualities and durability, their brittleness and low resistance to impact still limits wider applications. Here we present new laminated glass designs that contain toughening cross-ply architectures inspired from fish scales and arthropod cuticles. This seemingly minor enrichment completely transforms the way laminated glass deforms and fractures, and it turns a traditionally brittle material into a stretchy and tough material with little impact on surface hardness and optical quality...
May 10, 2018: Acta Biomaterialia
Minghua Li, Xiaoqin Yan, Zhuo Kang, Yahuan Huan, Yong Li, Ruxiao Zhang, Yue Zhang
The major restraint for the commercialization of the high-performance hybrid metal halide perovskite solar cells is the long-term stability, especially at the infirm interface between the perovskite film and organic charge transfer layer. Recently, engineering the interface between the perovskite and spiro-OMeTAD becomes an effective strategy to simultaneously improve the efficiency and stability in the perovskite solar cells. In this work, we demonstrated that introducing an interfacial polystyrene layer between the perovskite film and spiro-OMeTAD layer can effectively improve the perovskite solar cells photovoltaic performance...
May 11, 2018: ACS Applied Materials & Interfaces
Kalyan C Goddeti, Changhwan Lee, Young Keun Lee, Jeong Young Park
Titanium dioxide (TiO2 ) nanotubes with vertically aligned array structures show substantial advantages in solar cells as an electron transport material that offers a large surface area where charges travel linearly along the nanotubes. Integrating this one-dimensional semiconductor material with plasmonic metals to create a three-dimensional plasmonic nanodiode can influence solar energy conversion by utilizing the generated hot electrons. Here, we devised plasmonic Au/TiO2 and Ag/TiO2 nanodiode architectures composed of TiO2 nanotube arrays for enhanced photon absorption, and for the subsequent generation and capture of hot carriers...
May 9, 2018: Scientific Reports
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