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Shuying Wang, Xiaona Huang, Haoxuan Sun, Chunyang Wu
Inverted planar perovskite solar cells (PSCs), which are regarded as promising devices for new generation of photovoltaic systems, show many advantages, such as low-temperature film formation, low-cost fabrication, and smaller hysteresis compared with those of traditional n-i-p PSCs. As an important carrier transport layer in PSCs, the hole transport layer (HTL) considerably affects the device performance. Therefore, HTL modification becomes one of the most critical issues in improving the performance of PSCs...
December 13, 2017: Nanoscale Research Letters
Jisu Hong, Yeon Hee Ha, Hyojung Cha, Ran Kim, Yu Jin Kim, Chan Eon Park, James R Durrant, Soon-Ki Kwon, Tae Kyu An, Yun-Hi Kim
A series of naphthalene diimide (NDI)-based small molecules were synthesized as nonfullerene acceptors and incorporated in all-small-molecule solar cells. Three NDI-based small molecules, NDICN-T, NDICN-BT, and NDICN-TVT, were designed with different linkers between two NDI units to induce the different conjugation length and modulate the geometric structures of the NDI dimers. The small NDI-based dimer electron acceptors with slip-stacked structures that facilitate π-π stacking interactions and/or hinder excessive aggregation exhibited different morphological behaviors, such as miscibility or crystallinity in bulk heterojunction blends with 7,7'-(4,4-bis(2-ethylhexyl)-4H-silolo[3,2-b:4,5-b']dithiophene-2,6-diyl)bis(6-fluoro-4-(5'-hexyl-[2,2'-bithiophen]-5-yl)benzo[c][1,2,5]thiadiazole) (DTS-F) electron donors...
December 13, 2017: ACS Applied Materials & Interfaces
Changsoon Cho, Jung Hoon Song, Changjo Kim, Sohee Jeong, Jung-Yong Lee
Bandgap tunability and broadband absorption make quantum-dot (QD) photovoltaic cells (PVs) a promising candidate for future solar energy conversion systems. Approaches to improving the electrical properties of the active layer increase efficiency in part. The present study focuses on optical room for enhancement in QD PVs over wide spectrum in the near-infrared (NIR) region. We find that ray-optical light trapping schemes rather than the nanophotonics approach may be the best solution for enhancing broadband QD PVs by suppressing the escape probability of internal photons without spectral dependency...
December 12, 2017: Scientific Reports
Jingxiu Yang, Peng Zhang, Su-Huai Wei
Cs2AgBiBr6 was proposed as one of the inorganic, stable, and non-toxic replacement of the methylammonium lead halides (CH3NH3PbI3, which is currently considered as one of the most promising light-harvesting material for solar cells). However, the wide indirect band gap of Cs2AgBiBr6 suggests that its application in photovoltaics is limited. Here, using the first principle calculation, we show that by controlling the ordering parameter at the mixed sublattice, the band gap of Cs2AgBiBr6 can vary continuously from a wide indirect band gap of 1...
December 13, 2017: Journal of Physical Chemistry Letters
Gang Tang, Zewen Xiao, Hideo Hosono, Toshio Kamiya, Daining Fang, Jiawang Hong
Over the past few years, the development of lead-free and stabile perovskite absorbers with excellent performance has attracted extensive attention. Much effort has been devoted to screening and synthesizing this type of solar cell absorbers. Here, we present a general design strategy for designing the layered halide double perovskites Cs3+nM(II)nSb2X9+3n (M = Sn, Ge) with desired photovoltaic-relevant properties by inserting [MX6] octahedral layers, based on the principles of increased electronic dimensionality...
December 12, 2017: Journal of Physical Chemistry Letters
Junli Chang, Hong Chen, Hongkuan Yuan, Biao Wang, Xiaorui Chen
Organic-inorganic hybrid perovskites as new emerging functional materials stand out from numerous photovoltaic materials thanks to the unprecedentedly rapid improvement of their power conversion efficiency within a short period. To explore potentially more efficient photovoltaic candidates, the structural and electronic properties of FAxMA1-xPbI3 based on prototype MAPbI3 are investigated for superior performance. Specifically, structural relaxation is performed at the PBE+D2 level and the electronic and optical properties are investigated at the HSE + SOC level...
December 12, 2017: Physical Chemistry Chemical Physics: PCCP
Rafael Quintero-Bermudez, Randy P Sabatini, Marc Lejay, Oleksandr Voznyy, Edward H Sargent
Colloidal quantum dots (CQDs) enable low-cost, high-performance optoelectronic devices including photovoltaics, photodetectors, LEDs and lasers. Continuous-wave lasing in the near-infrared remains to be realized based on such materials; yet a solution-processed NIR laser would be of use in communications and interconnects. In infrared quantum dots, long-lived gain is hampered by a high rate of Auger recombination. Here we report the use of perovskite shells, grown on cores of IR-emitting PbS CQDs, and we reduce thereby the rate of Auger recombination by up to one order of magnitude...
December 11, 2017: ACS Nano
Reed Nieman, Hsinhan Tsai, Wanyi Nie, Adelia J A Aquino, Aditya D Mohite, Sergei Tretiak, Hao Li, Hans Lischka
Organic photovoltaic donor-acceptor junction devices composed of π-conjugated polymer electron donors (D) and fullerene electron acceptors (A) show greatly increased performance when a spacer material is inserted between the two layers (W. Y. Nie, G. Gupta, B. K. Crone, F. L. Liu, D. L. Smith, P. P. Ruden, C. Y. Kuo, H. Tsai, H. L. Wang, H. Li, S. Tretiak and A. D. Mohite, Adv. Sci., 2015, 2, 1500024.). For instance, experimental results reveal significant improvement of photocurrent when a terthiophene oligomer derivative is inserted in between π-conjugated poly(3-hexylthiophene-2,5-diyl) (P3HT) donor and C60 acceptor...
December 11, 2017: Nanoscale
Hyung-Jun Song, Byeong Guk Jeong, Jaehoon Lim, Doh C Lee, Wan Ki Bae, Victor I Klimov
Luminescent solar concentrators (LSCs) can serve as large-area sunlight collectors for photovoltaic devices. An important LSC characteristic is a concentration factor (C), which is defined as the ratio of the output and the input photon flux densities. This parameter can be also thought of as an effective enlargement factor of a solar cell active area. Based on thermodynamic considerations, the C-factor can reach extremely high values that exceed those accessible with traditional concentrating optics. In reality, however, the best reported values of C are around 30...
December 11, 2017: Nano Letters
Wanyi Nie, Hsinhan Tsai, Jean-Christophe Blancon, Fangze Liu, Costas C Stoumpos, Boubacar Traore, Mikael Kepenekian, Olivier Durand, Claudine Katan, Sergei Tretiak, Jared Crochet, Pulickel M Ajayan, MercouriG Kanatzidis, Jacky Even, Aditya D Mohite
Hybrid perovskites are on a trajectory toward realizing the most efficient single-junction, solution-processed photovoltaic devices. However, a critical issue is the limited understanding of the correlation between the degree of crystallinity and the emergent perovskite/hole (or electron) transport layer on device performance and photostability. Here, the controlled growth of hybrid perovskites on nickel oxide (NiO) is shown, resulting in the formation of thin films with enhanced crystallinity with characteristic peak width and splitting reminiscent of the tetragonal phase in single crystals...
December 11, 2017: Advanced Materials
Babu Halan, Jenny Tschörtner, Andreas Schmid
Abundant solar energy can be a sustainable source of energy. This chapter highlights recent advancements, challenges, and future scenarios in bioartificial photosynthesis, which is a new subset of bioelectrochemical systems (BESs) and technologies. BES technologies exploit the catalytic interactions between biological moieties and electrodes. At the nexus of BES and photovoltaics, this review focuses on light-harvesting technologies based on bioartificial photosynthesis. Such technologies are promising because electrical energy is generated from sunlight and water without the need for additional organic feedstock...
December 10, 2017: Advances in Biochemical Engineering/biotechnology
Honglei Wang, Shih-Chia Liu, Balasubramaniam Balachandran, Jiyoung Moon, Ross Haroldson, Zhitong Li, Artur Ishteev, Qing Gu, Weidong Zhou, Anvar Zakhidov, Walter Hu
Recently, solution-processed hybrid halide perovskite has emerged as promising materials for advanced optoelectronic devices such as photovoltaics, photodetectors, light emitting diodes and lasers. In the mean time, all-dielectric metasurfaces with high-index materials have attracted attention due to their low-loss and high-efficient optical resonances. Because of its tunable by composition band gap in the visible frequencies, organolead halide perovskite could serve as a powerful platform for realizing high-index, low-loss metasurfaces...
November 27, 2017: Optics Express
Jian Zhou, Yonggang Wu, Zihuan Xia, Xuefei Qin, Zongyi Zhang
Single nanowire solar cells show great promise for next-generation photovoltaics and for powering nanoscale devices. Here, we present a detailed study of light absorption in a single standing semiconductor-dielectric core-shell nanowire (CSNW). We find that the CSNW structure can not only concentrate the incident light into the structure, but also confine most of the concentrated light to the semiconductor core region, which boosts remarkably the light absorption cross-section of the semiconductor core. The CSNW can support multiple higher-order HE modes, as well as Fabry-Pérot (F-P) resonance, compared to the bare nanowire (BNW)...
November 27, 2017: Optics Express
Guillaume Fischer, Etienne Drahi, Martin Foldyna, Thomas A Germer, Erik V Johnson
Using a plasma to generate a surface texture with feature sizes on the order of tens to hundreds of nanometers ("nanotexturing") is a promising technique being considered to improve efficiency in thin, high-efficiency crystalline silicon solar cells. This study investigates the evolution of the optical properties of silicon samples with various initial surface finishes (from mirror polish to various states of micron-scale roughness) during a plasma nanotexturing process. It is shown that during said process, the appearance and growth of nanocone-like structures are essentially independent of the initial surface finish, as quantified by the auto-correlation function of the surface morphology...
November 27, 2017: Optics Express
Zhi-Gang Yu
Free-carrier absorption (FCA) in a semiconductor provides information about the band on which the free carriers reside, and in the classical limit, follows the $\omega^{-2}$ law with $\omega$ being the photon frequency. In hybrid organic-inorganic perovskites (HOIPs), the colossal Rashba effect (RE) results in a new band dispersion, characterized by wavevector $|{\bm k}|=k_0$ of band extremum and effective mass $m^*$. Here we show that the colossal RE in 2D HOIPs greatly enhances phonon-assisted FCA with a modified frequency dependence and induces a direct transition between the subbands with a resonance at $\hbar\omega=4R \equiv 2 \hbar^2 k^2_0/m^*$, which, under a magnetic field, exhibits a strong oscillatory magnetic circular dichroism (MCD)...
December 8, 2017: Journal of Physical Chemistry Letters
Ke Xiao, Can Cui, Peng Wang, Ping Lin, Yaping Qiang, Lingbo Xu, Jiangsheng Xie, Zhengrui Yang, Xiaodong Zhu, Xuegong Yu, Deren Yang
In the fabrication of high efficiency organic-inorganic metal halide perovskite solar cells (PSCs), an additional interface modifier is usually applied for enhancing the interface passivation and carrier transport. In this paper, we develop an innovative method with in-situ growth of one-dimensional perovskite nanowire (1D PNW) network triggered by Lewis amine over the perovskite films. To our knowledge, this is the first time to fabricate PSCs with shape-controlled perovskite surface morphology, which improved power conversion efficiency (PCE) from 14...
December 8, 2017: Nanotechnology
Yann Almadori, Nedjma Bendiab, Benjamin Grevin
Atomically thin transition metal dichalcogenides (TMDC) have become a new platform for the development of next-generation opto-electronic and light harvesting devices. Here, we report a Kelvin probe force microscopy (KPFM) investigation carried out on a type-II photovoltaic heterojunction based on WSe2 monolayer flakes and a bilayer MoS2 film stacked in vertical configuration on a Si/SiO2 substrate. Band offset characterized by a significant interfacial dipole is pointed out at the WSe2/MoS2 vertical junction...
December 8, 2017: ACS Applied Materials & Interfaces
Kyuwan Cho, Jinseck Kim, So Yeon Yoon, Ka Yeon Ryu, Song-Rim Jang, Bogyu Lim, Kyungkon Kim
The performance of organic photovoltaics (OPVs) based on the small-molecule organic semiconductor p-DTS(FBTTh2 )2 is greatly improved by the addition of a conjugated block copolymer composed of difluoroquinoxaline and thienopyrrolodione blocks (D130). The power conversion efficiency (PCE) of the p-DTS(FBTTh2 )2 -based OPV is improved from 5.08% to 6.75% by the addition of 5 wt% D130 to the photoactive layer, which is composed of p-DTS(FBTTh2 )2 and a fullerene derivative. Current-voltage and grazing incidence wide-angle X-ray scattering analyses revealed that the addition of D130 significantly reduces the trap density of the device and changes the packing orientation of p-DTS(FBTTh2 )2 from mostly edge-on to partially face-on...
December 8, 2017: Macromolecular Rapid Communications
N Moshonas, N A Stathopoulos, B T O'Connor, A Celik Bedeloglu, S P Savaidis, S Vasiliadis
An optical model has been developed and evaluated for the calculation of the external quantum efficiency of cylindrical fiber photovoltaic structures. The model is based on the transmission line theory and has been applied on single and bulk heterojunction fiber-photovoltaic cells. Using this model, optimum design characteristics have been proposed for both configurations, and comparison with experimental results has been assessed.
December 1, 2017: Applied Optics
Zhaolang Liu, Zhenhai Yang, Sudong Wu, Juye Zhu, Wei Guo, Jiang Sheng, Jichun Ye, Yi Cui
Carrier recombination and light management of the dopant-free silicon/organic heterojunction solar cells (HSCs) based on poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) are the critical factors in developing high-efficiency photovoltaic devices. However, the traditional passivation technologies can hardly provide efficient surface passivation on the front surface of Si. In this study, a photoinduced electric field was induced in a bilayer antireflective coating (ARC) of Polydimethylsiloxane (PDMS) and Titanium oxide (TiO2) films, due to formation of an accumulation layer of negative carriers (O2- species ) under UV (sunlight) illumination...
December 7, 2017: ACS Nano
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