scholarly journals Highly stretchable polymer semiconductor films through the nanoconfinement effect

Science ◽  
2017 ◽  
Vol 355 (6320) ◽  
pp. 59-64 ◽  
Author(s):  
Jie Xu ◽  
Sihong Wang ◽  
Ging-Ji Nathan Wang ◽  
Chenxin Zhu ◽  
Shaochuan Luo ◽  
...  
Keyword(s):  
Charge Transport ◽  
Light Emitting Diode ◽  
Wearable Electronics ◽  
Semiconductor Films ◽  
Light Emitting ◽  
Polymer Semiconductors ◽  
Polymer Semiconductor ◽  
Highly Stretchable ◽  
Transport Mobility ◽  
Semiconducting Film

Soft and conformable wearable electronics require stretchable semiconductors, but existing ones typically sacrifice charge transport mobility to achieve stretchability. We explore a concept based on the nanoconfinement of polymers to substantially improve the stretchability of polymer semiconductors, without affecting charge transport mobility. The increased polymer chain dynamics under nanoconfinement significantly reduces the modulus of the conjugated polymer and largely delays the onset of crack formation under strain. As a result, our fabricated semiconducting film can be stretched up to 100% strain without affecting mobility, retaining values comparable to that of amorphous silicon. The fully stretchable transistors exhibit high biaxial stretchability with minimal change in on current even when poked with a sharp object. We demonstrate a skinlike finger-wearable driver for a light-emitting diode.

Paper No S2.2: Ecofriendly Quantum Dot Light-Emitting Diode With Inorganic Charge Transport Layer

2015 ◽  
Vol 46 (S1) ◽  
pp. 10-10
Author(s):  
Min Suk Oh ◽  
C. J. Han ◽  
B. Yoo ◽  
J. Lee ◽  
H. Y. Kim ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Charge Transport ◽  
Light Emitting Diode ◽  
Transport Layer ◽  
Light Emitting ◽  
Charge Transport Layer

scholarly journals Solid-phase hetero epitaxial growth of α-phase formamidinium perovskite

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Jin-Wook Lee ◽  
Shaun Tan ◽  
Tae-Hee Han ◽  
Rui Wang ◽  
Lizhi Zhang ◽  
...  
Keyword(s):  
Defect Density ◽  
Solid Phase ◽  
Perovskite Phase ◽  
Light Emitting Diode ◽  
Growth Conditions ◽  
Layered Perovskite ◽  
Proof Of Concept ◽  
Semiconductor Films ◽  
Light Emitting ◽  
Crystalline Substrate

AbstractConventional epitaxy of semiconductor films requires a compatible single crystalline substrate and precisely controlled growth conditions, which limit the price competitiveness and versatility of the process. We demonstrate substrate-tolerant nano-heteroepitaxy (NHE) of high-quality formamidinium-lead-tri-iodide (FAPbI3) perovskite films. The layered perovskite templates the solid-state phase conversion of FAPbI3 from its hexagonal non-perovskite phase to the cubic perovskite polymorph, where the growth kinetics are controlled by a synergistic effect between strain and entropy. The slow heteroepitaxial crystal growth enlarged the perovskite crystals by 10-fold with a reduced defect density and strong preferred orientation. This NHE is readily applicable to various substrates used for devices. The proof-of-concept solar cell and light-emitting diode devices based on the NHE-FAPbI3 showed efficiencies and stabilities superior to those of devices fabricated without NHE.

A flexible, lightweight and stretchable all-solid-state supercapacitor based on warp-knitted stainless-steel mesh for wearable electronics

2022 ◽  
pp. 004051752110698
Author(s):  
Chuanli Su ◽  
Guangwei Shao ◽  
Qinghua Yu ◽  
Yaoli Huang ◽  
Jinhua Jiang ◽  
...  
Keyword(s):  
Stainless Steel ◽  
High Performance ◽  
Light Emitting Diode ◽  
Low Cost ◽  
Three Dimensional ◽  
Rate Capability ◽  
Cycling Stability ◽  
Wearable Electronics ◽  
Light Emitting ◽  
Dimensional Network

Highly conductive, flexible, stretchable and lightweight electrode substrates are essential to meet the future demand on supercapacitors for wearable electronics. However, it is difficult to achieve the above characteristics simultaneously. In this study, ultrafine stainless-steel fibers (with a diameter of ≈30 μm) are knitted into stainless-steel meshes (SSMs) with a diamond structure for the fabrication of textile stretchable electrodes and current collectors. The electrodes are fabricated by utilizing an electrodeposited three-dimensional network graphene framework and poly(3,4-ethylenedioxythiophene) (PEDOT) coating on the SSM substrates via a two-step electrodeposition process, which show a specific capacitance of 77.09 F g−1 (0.14 A g−1) and superb cycling stability (91% capacitance retention after 5000 cycles). Furthermore, the assembled flexible stretchable supercapacitor based on the PEDOT/reduced graphene oxide (RGO)@SSM electrodes exhibits an areal capacitance (53 mF cm−2 at 0.1 mA cm−2), a good cycling stability (≈73% capacitance retention after 5000 cycles), rate capability (36 mF cm−2 at 5 mA cm−2), stretchable stability (≈78% capacitance retention at 10% strain for 500 stretching cycles) and outstanding flexibility and stability under various bending deformations. The assembled supercapacitors can illuminate a thermometer and a light-emitting diode, demonstrating their potential application as stretchable supercapacitors. This simple and low-cost method developed for fabricating lightweight, stretchable and stable high-performance supercapacitors offers new opportunities for future stretchable electronic devices.

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