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organic solar cell

Azadeh Rahimi Chatri, Solmaz Torabi, Vincent Marc Le Corre, L Jan Anton Koster
In recent years, the efficiency of organic solar cells (OSCs) has increased to more than 13%, while different barriers are on the way for reaching higher efficiencies. One crucial barrier is the recombination of charge carriers, which can either occur as the bulk recombination of photogenerated charges or the recombination of photogenerated charges and electrodic induced charges (EICs). This work studies the impact of EICs on the recombination lifetime in OSCs. To this end, the net recombination lifetime of photogenerated charge carriers in the presence of EICs is measured by means of conventional and newly developed transient photovoltage techniques...
March 16, 2018: ACS Applied Materials & Interfaces
Ahmed Mourtada Elseman, Ahmed Esmail Shalan, Sajid Sajid, Mohamed Mohamed Rashad, Ali Mostafa Hassan, Meicheng Li
Toxicity as well as chemical instability issues of halide perovskites based on organic-inorganic lead-containing materials still remains the main drawbacks for perovskite solar cells (PSCs). Herein, we discuss the preparation of copper (Cu)-based hybrid materials, where we replace lead (Pb) with non-toxic Cu metal for lead free perovskite solar cells; investigate of its potential towards solar cells applications based on experimental and theoretical studies. The formation of (CH3NH3)2CuX4 [(CH3NH3)2CuCl4, (CH3NH3)2CuCl2I2, and (CH3NH3)2CuCl2Br2] were discussed in details...
March 16, 2018: ACS Applied Materials & Interfaces
Cristina Rodríguez-Seco, Lydia Cabau, Anton Vidal-Ferran, Emilio Palomares
Over hundreds of new organic semiconductor molecules have been synthesized as hole transport materials (HTMs) for perovskite solar cells. However, to date, the well-known N2 , N2 , N2' , N2' , N7 , N7 , N7' , octakis-(4-methoxyphenyl)-9,9-spirobi-[9,9'-spirobi[9 H-fluorene]-2,2',7,7'-tetramine (spiro-OMeTAD) is still the best choice for the best perovskite device performance. Nevertheless, there is a consensus that spiro-OMeTAD by itself is not stable enough for long-term stable devices, and its market price makes its use in large-scale production costly...
March 15, 2018: Accounts of Chemical Research
Juan Zhao, Zhihe Chi, Zhan Yang, Xiaojie Chen, Michael S Arnold, Yi Zhang, Jiarui Xu, Zhenguo Chi, Matthew P Aldred
Truly stretchable electronics, wherein all components themselves permit elastic deformation as the whole devices are stretched, exhibit unique advantages over other strategies, such as simple fabrication process, high integrity of entire components and intimate integration with curvilinear surfaces. In contrast to the stretchable devices using stretchable interconnectors to integrate with rigid active devices, truly stretchable devices are realized with or without intentionally employing structural engineering (e...
March 15, 2018: Nanoscale
Bo Li, Yanan Zhang, Lin Fu, Tong Yu, Shujie Zhou, Luyuan Zhang, Longwei Yin
Owing to inevitable thermal/moisture instability for organic-inorganic hybrid perovskites, pure inorganic perovskite cesium lead halides with both inherent stability and prominent photovoltaic performance have become research hotspots as a promising candidate for commercial perovskite solar cells. However, it is still a serious challenge to synthesize desired cubic cesium lead iodides (CsPbI3 ) with superior photovoltaic performance for its thermodynamically metastable characteristics. Herein, polymer poly-vinylpyrrolidone (PVP)-induced surface passivation engineering is reported to synthesize extra-long-term stable cubic CsPbI3 ...
March 14, 2018: Nature Communications
Zhao Xiaojuan, Leiming Tao, Hao Li, Wenchao Huang, Pengyu Sun, Jun Liu, Shuangshuang Liu, Qiang Sun, Zhifang Cui, Lijie Sun, Yan Shen, Yang Yang, Mingkui Wang
Organic-inorganic hybrid lead halide perovskites have been widely investigated in optoelectronics both experimentally and theoretically. The present work incorporates chemical modified graphene into nanocrystal SnO2 as electron transporting layer (ETL) for highly efficient planar perovskite solar cells. The modification of SnO2 with highly conductive two-dimensional naphthalene diimide-graphene can increase surface hydrophobicity and form van der Waals interaction between the surfactant and the organic-inorganic hybrid lead halide perovskite compounds...
March 14, 2018: Nano Letters
Lijian Zuo, Xueliang Shi, Sae Byeok Jo, Yun Liu, Fracis Lin, Alex K-Y Jen
Limited by the various inherent energy losses from multiple channels, organic solar cells show inferior device performance compared to traditional inorganic photovoltaic techniques, such as silicon and CuInGaSe. To alleviate these fundamental limitations, an integrated multiple strategy is implemented including molecular design, interfacial engineering, optical manipulation, and tandem device construction into one cell. Considering the close correlation among these loss channels, a sophisticated quantification of energy-loss reduction is tracked along with each strategy in a perspective to reach rational overall optimum...
March 13, 2018: Advanced Materials
Wentao Huang, Yen-Hung Lin, Thomas D Anthopoulos
Combining high charge carrier mobility with ambipolar transport in light-absorbing organic semiconductors is highly desirable as it leads to enhanced charge photogeneration, and hence improved performance, in various optoelectronic devices including solar cells and photodetectors. Here we report the development of [6,6]-phenyl-C61 -butyric acid methyl ester (PC61 BM)-based ultraviolet (UV) phototransistors with balanced electron and hole transport characteristics. The latter is achieved by fine-tuning the source-drain electrode work function using a self-assembled monolayer...
March 13, 2018: ACS Applied Materials & Interfaces
Wanning Li, Long Ye, Sunsun Li, Huifeng Yao, Harald Ade, Jianhui Hou
Besides broadening of the absorption spectrum, modulating molecular energy levels, and other well-studied properties, a stronger intramolecular electron push-pull effect also affords other advantages in nonfullerene acceptors. A strong push-pull effect improves the dipole moment of the wings in IT-4F over IT-M and results in a lower miscibility than IT-M when blended with PBDB-TF. This feature leads to higher domain purity in the PBDB-TF:IT-4F blend and makes a contribution to the better photovoltaic performance...
March 13, 2018: Advanced Materials
Roberta R Rodrigues, Jared Heath Delcamp, Hammad Cheema
The development of high voltage solar cells is an attractive way to use sunlight for solar-to-fuel devices, multijunction solar-to-electric systems, and to power limited area consumer electronics. By designing a low oxidation potential organic dye (RR9)/redox shuttle (Fe(bpy)33+/2+) pair for dye-sensitized solar cell (DSC) devices, the highest single device photovoltage (1.42 V) has been realized for a DSC not relying on doped TiO2. Additionally, Fe(bpy)33+/2+ offers a robust, readily tunable ligand platform for redox potential tuning...
March 12, 2018: Angewandte Chemie
Yao Liu, Zachariah A Page, Dongming Zhou, Volodimyr V Duzhko, Kevin R Kittilstved, Todd Emrick, Thomas P Russell
While perovskite solar cells have invigorated the photovoltaic research community due to their excellent power conversion efficiencies (PCEs), these devices notably suffer from poor stability. To address this crucial issue, a solution-processable organic chemical inhibition layer (OCIL) was integrated into perovskite solar cells, resulting in improved device stability and a maximum PCE of 16.3%. Photoenhanced self-doping of the fulleropyrrolidine mixture in the interlayers afforded devices that were advantageously insensitive to OCIL thickness, ranging from 4 to 190 nm...
February 28, 2018: ACS Central Science
Hideaki Komiyama, Takahiro To, Seiichi Furukawa, Yu Hidaka, Woong Shin, Takahiro Ichikawa, Ryota Arai, Takuma Yasuda
Solution-processed organic solar cells (OSCs) based on narrow-bandgap small molecules hold great promise as next-generation energy-converting devices. In this paper, we focus on a family of A-π-D-π-A-type small molecules, namely, BDT-nT-ID (n = 1-4) oligomers, consisting of benzo[1,2-b:4,5-b']dithiophene (BDT) as the central electron-donating (D) core, 1,3-indandione (ID) as the terminal electron-accepting (A) units, and two regioregular oligo(3-hexylthiophene)s (nT) with different numbers of thiophene rings as the π-bridging units, and elucidate their structure-property-function relationships...
March 12, 2018: ACS Applied Materials & Interfaces
Jia Sun, Xiaoling Ma, Zhuohan Zhang, Jiangsheng Yu, Jie Zhou, Xinxing Yin, Linqiang Yang, Renyong Geng, Rihong Zhu, Fujun Zhang, Weihua Tang
A new electron-rich central building block, 5,5,12,12-tetrakis(4-hexylphenyl)-indacenobis-(dithieno[3,2-b:2',3'-d]pyrrol) (INP), and two derivative nonfullerene acceptors (INPIC and INPIC-4F) are designed and synthesized. The two molecules reveal broad (600-900 nm) and strong absorption due to the satisfactory electron-donating ability of INP. Compared with its counterpart INPIC, fluorinated nonfullerene acceptor INPIC-4F exhibits a stronger near-infrared absorption with a narrower optical bandgap of 1.39 eV, an improved crystallinity with higher electron mobility, and down-shifted highest occupied molecular orbital and lowest unoccupied molecular orbital energy levels...
March 12, 2018: Advanced Materials
Fan Wu, Qiquan Qiao, Behzad Bahrami, Ke Chen, Rajesh Pathak, Yanhua Tong, Xiaoyi Li, Tiansheng Zhang, Ronghua Jian
We present a method to synthesize CuO nanorod array/TiO<sub>2</sub> nanocrystals bulk heterojunction on fluorin-tin-oxide (FTO) glass, in which single-crystalline p-type semiconductor of the CuO nanorod array is grown on the FTO glass by hydrothermal reaction and the n-type semiconductor of the TiO<sub>2</sub> precursor is filled into the CuO nanorods to form well-organized nano-interpenetrating bulk heterojunction after air annealing. The interface charge transfer in CuO nanorod array/TiO<sub>2</sub> heterojunction is studied by Kelvin probe force microscopy (KPFM)...
March 9, 2018: Nanotechnology
Bo Xiao, Ailing Tang, Jing Yang, Asif Mahmood, Xiangnan Sun, Erjun Zhou
We used the quinoxaline (Qx) unit to design and synthesize two non-fullerene small molecular acceptors (NFSMAs) of Qx1 and Qx1b with A2=A1-D-A1=A2 skeleton, where indacenodithiophene (IDT), Qx and rhodanine (R) were adopted as the central donor (D), bridge acceptors (A1) and terminal acceptors (A2). Qx1 and Qx1b contain the different side chains of 4-hexylphenyl and octyl in the central IDT segment in order to modify the properties of final small molecules. Both small molecules show good thermal stability, high solubility, strong and broad absorption spectra with optical bandgaps of 1...
March 9, 2018: ACS Applied Materials & Interfaces
Anping Cao, Meixia Shan, Laura Paltrinieri, Wiel H Evers, Liangyong Chu, Lukasz Poltorak, Johan H Klootwijk, Beatriz Seoane, Jorge Gascon, Ernst J R Sudhölter, Louis C P M de Smet
Recently various porous organic frameworks (POFs, crystalline or amorphous materials) have been discovered, and used for a wide range of applications, including molecular separations and catalysis. Silicon nanowires (SiNWs) have been extensively studied for diverse applications, including as transistors, solar cells, lithium ion batteries and sensors. Here we demonstrate the functionalization of SiNW surfaces with POFs and explore its effect on the electrical sensing properties of SiNW-based devices. The surface modification by POFs was easily achieved by polycondensation on amine-modified SiNWs...
March 9, 2018: Nanoscale
Chong Liu, Wenzhe Li, Cuiling Zhang, Yunping Ma, Jiandong Fan, Yaohua Mai
All-inorganic perovskite solar cells provide a promising solution to tackle the thermal instability problem of organic-inorganic perovskite solar cells. Herein, we designed an all-inorganic perovskite solar cell with novel structure (FTO/NiOx/CsPbI2Br/ZnO@C60/Ag), in which ZnO@C60 bilayer were utilized as the electron-transporting layers that demonstrated high carrier extraction efficiency and low leakage loss. Conse-quently, the as-fabricated all-inorganic CsPbI2Br perovskite solar cell yielded the power conversion efficiency (PCE) as high as 13...
March 8, 2018: Journal of the American Chemical Society
Haihua Zhang, Qing Liao, Yishi Wu, Zhaoyi Zhang, Qinggang Gao, Peng Liu, Meili Li, Jiannian Yao, Hongbing Fu
3D organic-inorganic hybrid perovskites have featured high gain coefficients through the electron-hole plasma stimulated emission mechanism, while their 2D counterparts of Ruddlesden-Popper perovskites (RPPs) exhibit strongly bound electron-hole pairs (excitons) at room temperature. High-performance solar cells and light-emitting diodes (LEDs) are reported based on 2D RPPs, whereas light-amplification devices remain largely unexplored. Here, it is demonstrated that ultrafast energy transfer along cascade quantum well (QW) structures in 2D RPPs concentrates photogenerated carriers on the lowest-bandgap QW state, at which population inversion can be readily established enabling room-temperature amplified spontaneous emission and lasing...
March 8, 2018: Advanced Materials
Yuze Lin, Fuwen Zhao, Shyamal K K Prasad, Jing-De Chen, Wanzhu Cai, Qianqian Zhang, Kai Chen, Yang Wu, Wei Ma, Feng Gao, Jian-Xin Tang, Chunru Wang, Wei You, Justin M Hodgkiss, Xiaowei Zhan
Relative to electron donors for bulk heterojunction organic solar cells (OSCs), electron acceptors that absorb strongly in the visible and even near-infrared region are less well developed, which hinders the further development of OSCs. Fullerenes as traditional electron acceptors have relatively weak visible absorption and limited electronic tunability, which constrains the optical and electronic properties required of the donor. Here, high-performance fullerene-free OSCs based on a combination of a medium-bandgap polymer donor (FTAZ) and a narrow-bandgap nonfullerene acceptor (IDIC), which exhibit complementary absorption, matched energy levels, and blend with pure phases on the exciton diffusion length scale, are reported...
March 7, 2018: Advanced Materials
Ping Li, Bo Wu, Jin Xiang, Xiu De Yang, Hai Shen Huang, Guang Dong Zhou, Qun Liang Song
Many physical processes such as exciton interfacial dissociation, exciton interfacial recombination, and exciton-electron and exciton-hole interactions coexist at the interface of organic solar cells (OSC). In this study, the direction of free charge generation is defined as the direction from the interface to the side where free charges are left. For a p-n type device, the direction of free electron (hole) generation from exciton dissociation at the donor/accepter (D/A) interface is the same as the subsequent transportation direction under the built-in electric field...
March 7, 2018: Physical Chemistry Chemical Physics: PCCP
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