Effect of thermal annealing on the electrical properties of P3HT:PC70BM nanocomposites

Aloui, Walid; Adhikari, Tham; Nunzi, Jean‐Michel; Bouazizi, Abdelaziz; Khirouni, K.

doi:10.1016/j.mssp.2015.05.060

Cited by 20 publications

(11 citation statements)

References 31 publications

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“…32 For all blends with P3HT, one major diffraction peak corresponding to the [100] plane was observed 2θ = 5-7°), showing the first-order structure of P3HT with a d spacing of 1.7 nm. 44,45 Pristine films of P3HT:DPP blends exhibit weak XRD peak intensity as compared to annealed samples. The weak intensity observed for pristine films is due to the low-order structure of P3HT.…”

Section: Xrd For Blends Of P3ht and Dpp-rhodanine Derivativesmentioning

confidence: 99%

Solid-state showdown: Comparing the photovoltaic performance of amorphous and crystalline small-molecule diketopyrrolopyrrole acceptors

Adhikari

Nunzi

Lebel

2017

Organic Electronics

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A novel glass-forming diketopyrrolpyrrole (DPP) derivative (DPP-glass) and a crystalline isoelectronic analogue were synthesized and their photophysical, electrochemical and photovoltaic properties were investigated. The compounds were processed into thin films that were further studied by Atomic force microscopy (AFM) and X-ray diffraction (XRD). Solution-processed inverted and regular bulk heterojunction photovoltaic cells were fabricated in different blend ratios with P3HT as donor. Both DPP derivatives show appreciable photovoltaic performance with power conversion efficiencies (PCE) ranging from 0.34-2.54%. The regular device with amorphous DPP-glass showed the highest efficiency (2.54 %) in the blend ratio 1:2 whereas the device with crystalline DPP derivative shows an efficiency 1.59% under simulated 1.5 solar irradiation of 100 mWcm -2 . The better performance of DPP-glass in comparison to its crystalline analogue is attributed to a more uniform film morphology and fewer defects, leading to improved electron mobility.

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Section: Xrd For Blends Of P3ht and Dpp-rhodanine Derivativesmentioning

confidence: 99%

Solid-state showdown: Comparing the photovoltaic performance of amorphous and crystalline small-molecule diketopyrrolopyrrole acceptors

Adhikari

Nunzi

Lebel

2017

Organic Electronics

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“…During patterning of the PLED and PMemC devices, laser irradiation directly onto the fabricated polymer devices decreased the current density at a given bias. However, there have been many reports where the current density increased with an increase of annealing temperature for devices using polymer Super Yellow and P3HT. , The reasons for the increased current density were investigated and determined to be due to (i) an increase in conductivity arising from the denser film, (ii) a better electrical contact with the bottom electrode attributed to structural changes in the polymer-conjugated backbones, , and (iii) a change in energy level resulting in better charge injection . The contact between the polymer film and the top metal electrode was determined to be independent of the polymer thin film processing condition .…”

Section: Resultsmentioning

confidence: 99%

Effect of Laser-Induced Direct Micropatterning on Polymer Optoelectronic Devices

Yun

Han

Kang

et al. 2019

ACS Appl. Mater. Interfaces

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Solution-processed polymer devices have been studied as a low-cost alternative to the conventional vacuum-processed organic devices. However, forming a specific pattern on polymer semiconductor films without costly lithography is still challenging. Herein, we report a low-cost direct patterning method for polymer optoelectronic devices, which can successfully engrave designated patterns on the polymer semiconductor layer regardless of its size and even after device encapsulation. Irradiation of a 100 ns pulse laser forms high-resolution patterns on devices such as polymer light-emitting diodes and polymer memory devices. The biggest advantage of the proposed patterning method is that it does not produce any physical damage in the device, such as leakage current or degraded light-emitting efficiency. Analysis confirms that the laser-induced heat alters the solid or crystal structure of the polymer semiconducting layers so that the designated areas of the polymer devices can be selectively and deliberately deactivated. We demonstrate the usability of the developed laser-induced direct-patterning method on the polymer devices by engraving a digital image onto “ON-state” light-emitting devices and by generating multiple states onto a 4 × 4 matrix polymer nonvolatile memory.

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“…X-ray diffraction (XRD) patterns for the control P3HT:PCBM blend without and with annealing at 110 for 30 minutes ( Figure 4) show one major diffraction peak corresponding to the [100] plane at 2θ = 5-7°, showing the first-order structure of P3HT with a d spacing of 1.7 nm. [43][44] Expectedly, annealing caused an increase in the intensity of the diffaction peak. The weak intensity observed for unannealed films is due to the low-ordered structure of P3HT, whereas thermal annealing at 110 for 30 minutes causes the side chains of P3HT to pack in a more ordered fashion, leading to an increase in crystallinity.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Efficiency enhancement of ternary blend organic photovoltaic cells with molecular glasses as guest acceptors

Adhikari

Bobbara

Nunzi

et al. 2018

Organic Electronics

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Previously reported glass-forming perylenediimide (PDI-glass) and diketopyrrolopyrrole (DPP-glass) acceptors were used as ternary components to modulate the morphology and electron transport properties of bulk heterojunctions composed of the polymer blend poly(3hexythiophene) (P3HT) and [6,6]-phenyl-C 61-butyric acid methyl ester (PC 61 BM). Both ternary acceptors show strong absorption in the visible range and energy levels intermediate between that of P3HT and PCBM. In the blends, both amorphous materials occupy the interface between P3HT and PCBM domains without significantly altering film morphology. The incorporation of 20 % PDI-glass and 15 % DPP-glass in ternary blend devices has resulted in conversion efficiency enhancements of 38% and 36 %, respectively. Additionally, the incident photon to electron conversion efficiency of the ternary devices of these materials was increased with additional photocurrent between 660-750 nm, indicating that these materials efficiently contribute to light harvesting. This justifies the efficiency enhancements via the charge transfer mechanism. Furthermore, these ternary devices show high stability towards both moisture and oxygen.

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Effect of thermal annealing on the electrical properties of P3HT:PC70BM nanocomposites

Cited by 20 publications

References 31 publications

Solid-state showdown: Comparing the photovoltaic performance of amorphous and crystalline small-molecule diketopyrrolopyrrole acceptors

Solid-state showdown: Comparing the photovoltaic performance of amorphous and crystalline small-molecule diketopyrrolopyrrole acceptors

Effect of Laser-Induced Direct Micropatterning on Polymer Optoelectronic Devices

Efficiency enhancement of ternary blend organic photovoltaic cells with molecular glasses as guest acceptors

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