scholarly journals Comparing the microstructure and photovoltaic performance of 3 perylene imide acceptors with similar energy levels but different packing tendencies

2022 ◽  
Author(s):  
Rana Adel ◽  
Elena Gala ◽  
Matías J. Alonso-Navarro ◽  
Edgar Gutierrez ◽  
Jaime Martin ◽  
...  
Keyword(s):  
Organic Photovoltaics ◽  
Energy Levels ◽  
Photovoltaic Performance ◽  
Molecular Packing

While it is widely recognized that microstructure plays an important role in the performance of organic photovoltaics (OPV), systematic studies are often challenging, as varying the molecular packing through typical...

scholarly journals Molecular-level architectural design using benzothiadiazole-based polymers for photovoltaic applications

2017 ◽  
Vol 13 ◽  
pp. 863-873 ◽  
Author(s):  
Vinila N Viswanathan ◽  
Arun D Rao ◽  
Upendra K Pandey ◽  
Arul Varman Kesavan ◽  
Praveen C Ramamurthy
Keyword(s):  
Molecular Orbital ◽  
Architectural Design ◽  
Density Functional ◽  
Short Circuit ◽  
Energy Levels ◽  
Photovoltaic Performance ◽  
Hole Mobility ◽  
Short Circuit Current ◽  
Open Circuit ◽  
Lowest Unoccupied Molecular Orbital

A series of low band gap, planar conjugated polymers, P1 (PFDTBT), P2 (PFDTDFBT) and P3 (PFDTTBT), based on fluorene and benzothiadiazole, was synthesized. The effect of fluorine substitution and fused aromatic spacers on the optoelectronic and photovoltaic performance was studied. The polymer, derived from dithienylated benzothiodiazole and fluorene, P1, exhibited a highest occupied molecular orbital (HOMO) energy level at −5.48 eV. Density functional theory (DFT) studies as well as experimental measurements suggested that upon substitution of the acceptor with fluorine, both the HOMO and lowest unoccupied molecular orbital (LUMO) energy levels of the resulting polymer, P2, were lowered, leading to a higher open circuit voltage and short circuit current with an overall improvement of more than 110% for the photovoltaic devices. Moreover, a decrease in the torsion angle between the units was also observed for the fluorinated polymer P2 due to the enhanced electrostatic interaction between the fluorine substituents and sulfur atoms, leading to a high hole mobility. The use of a fused π-bridge in polymer P3 for the enhancement of the planarity as compared to the P1 backbone was also studied. This enhanced planarity led to the highest observed mobility among the reported three polymers as well as to an improvement in the device efficiency by more than 40% for P3.

scholarly journals Polymerized small molecular acceptor based all-polymer solar cells with an efficiency of 16.16% via tuning polymer blend morphology by molecular design

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Jiaqi Du ◽  
Ke Hu ◽  
Jinyuan Zhang ◽  
Lei Meng ◽  
Jiling Yue ◽  
...  
Keyword(s):  
Solar Cells ◽  
Molecular Design ◽  
Polymer Solar Cells ◽  
Energy Levels ◽  
Photovoltaic Performance ◽  
Electronic Energy ◽  
Force Microscopy ◽  
Transmission Electron ◽  
Electronic Energy Levels ◽  
20 Nm

AbstractAll-polymer solar cells (all-PSCs) based on polymerized small molecular acceptors (PSMAs) have made significant progress recently. Here, we synthesize two A-DA’D-A small molecule acceptor based PSMAs of PS-Se with benzo[c][1,2,5]thiadiazole A’-core and PN-Se with benzotriazole A’-core, for the studies of the effect of molecular structure on the photovoltaic performance of the PSMAs. The two PSMAs possess broad absorption with PN-Se showing more red-shifted absorption than PS-Se and suitable electronic energy levels for the application as polymer acceptors in the all-PSCs with PBDB-T as polymer donor. Cryogenic transmission electron microscopy visualizes the aggregation behavior of the PBDB-T donor and the PSMA in their solutions. In addition, a bicontinuous-interpenetrating network in the PBDB-T:PN-Se blend film with aggregation size of 10~20 nm is clearly observed by the photoinduced force microscopy. The desirable morphology of the PBDB-T:PN-Se active layer leads its all-PSC showing higher power conversion efficiency of 16.16%.

scholarly journals Modulated Photocurrent Spectroscopy Study of the Electronic Transport Properties of Working Organic Photovoltaics: Degradation Analysis

Materials ◽  
2020 ◽  
Vol 13 (11) ◽  
pp. 2660
Author(s):  
Emi Nakatsuka ◽  
Yo Kumoda ◽  
Kiyohito Mori ◽  
Takashi Kobayashi ◽  
Takashi Nagase ◽  
...  
Keyword(s):  
Transport Properties ◽  
Organic Photovoltaics ◽  
Electronic Transport ◽  
Short Circuit ◽  
Photovoltaic Performance ◽  
Acid Methyl Ester ◽  
Short Circuit Current ◽  
Electronic Transport Properties ◽  
Photocurrent Spectroscopy ◽  
Donor And Acceptor

Electronic transport measurement using modulated photocurrent (MPC) spectroscopy is demonstrated herein in working organic photovoltaics (OPVs) before and after AM1.5G irradiation. OPVs with bulk heterojunction (BHJ) using prototypical donor and acceptor materials, poly[[4,8-bis[(2-ethylhexyl)oxy]benzo[1–2-b:4,5-b′]dithiophene-2,6-diyl][3-fluoro-2-[(2-ethylhexyl)carbonyl] = hieno [3–4-b]thiophenediyl]] (PTB7) and [6,6]-phenyl-C71-butyric acid methyl ester (PC71BM), were fabricated. The OPVs had inverted structures (BHJs are formed on transparent conductive oxide substrates). The photovoltaic performance of PTB7:PC71BM OPVs was characterized and the best power conversion efficiency was obtained at PTB7 content of 40 wt%. Electron and hole mobility were determined with MPC spectroscopy in PTB7:PC71BM OPVs and were well balanced at PTB7 content of 40 wt%. Degradation of the photovoltaic performance of PTB7:PC71BM OPVs with PTB7 content of 40 wt% caused by AM1.5G irradiation was studied. MPC spectroscopy showed that the well-balanced mobility was not affected by AM1.5G irradiation. The degradation of OPVs was not due to changes in the electronic transport properties, but mainly to the reduced short circuit current (Jsc) and fill factor (FF). The origin of this reduction is discussed.

scholarly journals Benzotrithiophene Copolymers: Influence of Molecular Packing and Energy Levels on Charge Carrier Mobility

2014 ◽  
Vol 47 (9) ◽  
pp. 2883-2890 ◽  
Author(s):  
Bob C. Schroeder ◽  
Stephan Rossbauer ◽  
R. Joseph Kline ◽  
Laure Biniek ◽  
Scott E. Watkins ◽  
...  
Keyword(s):  
Charge Carrier ◽  
Carrier Mobility ◽  
Energy Levels ◽  
Charge Carrier Mobility ◽  
Molecular Packing

Functionalized Rosette Nanotubes as Novel Electron Donor Materials for Solution-Processed Organic Photovoltaics

2015 ◽  
Vol 1737 ◽  
Author(s):  
Liang Shuai ◽  
Venkatakrishnan Parthasarathy ◽  
Jae-Young Cho ◽  
Takeshi Yamazaki ◽  
Rachel L. Beingessner ◽  
...  
Keyword(s):  
Electron Donor ◽  
Organic Photovoltaics ◽  
Energy Levels ◽  
Spectroscopic Techniques ◽  
Solution Processed ◽  
Rosette Nanotubes ◽  
Self Assembling ◽  
Hybrid Molecules ◽  
Homo And Lumo ◽  
Homo And Lumo Energy

ABSTRACTTwo self-assembling twin guanine-cytosine (G∧C) hybrid molecules featuring porphyrin (TPPO-(G∧C)2) and oligothiophene groups (6T-(G∧C)2) were synthesized. In organic solution, these molecules self-assemble into one-dimensional rosette nanotubes (RNTs) featuring the porphyrin or oligiothiophene groups on the outer surface. Using a combination of imaging and spectroscopic techniques we established the structure of the TPPO-(G∧C)2 and 6T-(G∧C)2 RNTs and compared the HOMO and LUMO energy levels with PC61BM, a well-known electron acceptor material. These studies, in combination with solid-state photoluminescence data of PC61BM-TPPO-(G∧C)2 RNT blended thin films, indicates that these self-assembled nanomaterials have great potential as electron donor materials for solution-processed organic photovoltaics.

Influence of polymer side chains on the photovoltaic performance of non-fullerene organic solar cells

2017 ◽  
Vol 5 (4) ◽  
pp. 937-942 ◽  
Author(s):  
Xue Gong ◽  
Guangwu Li ◽  
Shiyu Feng ◽  
Liangliang Wu ◽  
Yahui Liu ◽  
...  
Keyword(s):  
Solar Cells ◽  
Energy Level ◽  
Organic Solar Cells ◽  
Photovoltaic Performance ◽  
Great Influence ◽  
Molecular Packing ◽  
Side Chains ◽  
Blend Morphology

The side chains of polymers had a great influence on their molecular packing, energy level, blend morphology and photovoltaic performance. The PCEs of 7.28% and 1.55% were obtained for alkoxy and alkylthio-substituted polymer based non-fullerene solar cells, respectively.

A high-performance non-fullerene electron acceptor with bisalkylthiothiophene π-bridges for organic photovoltaics

2019 ◽  
Vol 7 (46) ◽  
pp. 14499-14503
Author(s):  
Zhaolong Wang ◽  
Kunxiang Huang ◽  
Xianjie Chen ◽  
Yating Xu ◽  
Zheng Xu ◽  
...  
Keyword(s):  
Electron Acceptor ◽  
Organic Photovoltaics ◽  
High Performance ◽  
Photovoltaic Performance

A non-fullerene acceptor IDT2ST-4F bearing a bisalkylthiothiophene unit as the π-bridge was designed and synthesized, and its photovoltaic performance was investigated.

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