scholarly journals Variation of the Side Chain Branch Position Leads to Vastly Improved Molecular Weight and OPV Performance in 4,8-dialkoxybenzo[1,2-b:4,5-b′]dithiophene/2,1,3-benzothiadiazole Copolymers

2011 ◽  
Vol 2011 ◽  
pp. 1-10 ◽  
Author(s):  
Robert C. Coffin ◽  
Christopher M. MacNeill ◽  
Eric D. Peterson ◽  
Jeremy W. Ward ◽  
Jack W. Owen ◽  
...  
Keyword(s):  
Thin Film ◽  
Molecular Weight ◽  
Thin Film Transistor ◽  
Power Conversion ◽  
Hole Mobility ◽  
Side Chain ◽  
Side Chains ◽  
Absorption Profile ◽  
Polymer Backbone ◽  
Chain Branch

Through manipulation of the solubilizing side chains, we were able to dramatically improve the molecular weight(Mw)of 4,8-dialkoxybenzo[1,2-b:4,5-b′]dithiophene (BDT)/2,1,3-benzothiadiazole (BT) copolymers. When dodecyl side chains (P1) are employed at the 4- and 8-positions of the BDT unit, we obtain a chloroform-soluble copolymer fraction withMwof 6.3 kg/mol. Surprisingly, by moving to the commonly employed 2-ethylhexyl branch (P2),Mwdecreases to 3.4 kg/mol. This is despite numerous reports that this side chain increases solubility andMw. By moving the ethyl branch in one position relative to the polymer backbone (1-ethylhexyl,P3),Mwis dramatically increased to 68.8 kg/mol. As a result of thisMwincrease, the shape of the absorption profile is dramatically altered, withλmax= 637 nm compared with 598 nm forP1and 579 nm forP2. The hole mobility as determined by thin film transistor (TFT) measurements is improved from~1×10−6 cm2/Vs forP1andP2to7×10−4 cm2/Vs forP3, while solar cell power conversion efficiency in increased to2.91%forP3relative to0.31%and0.19%forP1andP2, respectively.

The influence of molecular weight on the microstructure and thin film transistor characteristics of pBTTT polymers.

2006 ◽  
Author(s):  
Rick Hamilton ◽  
Clare Bailey ◽  
Warren Duffy ◽  
Martin Heeney ◽  
Maxim Shkunov ◽  
...  
Keyword(s):  
Thin Film ◽  
Molecular Weight ◽  
Thin Film Transistor

Diketopyrrolopyrrole-based polymer with a semi-fluorinated side chain for high-performance organic thin-film transistors

RSC Advances ◽  
2016 ◽  
Vol 6 (35) ◽  
pp. 29164-29171 ◽  
Author(s):  
Kangjian Miao ◽  
Gil Jo Chae ◽  
Xiaoxue Wu ◽  
Qinghai Shu ◽  
Xin Zhu ◽  
...  
Keyword(s):  
Thin Film ◽  
Thin Film Transistors ◽  
High Performance ◽  
Hole Mobility ◽  
Organic Thin Film Transistors ◽  
Side Chain ◽  
Organic Thin Film

A semi-fluorinated DPP based polymer showed hole mobility about 3 times higher than did its non-fluorinated analogue.

Yttrium-doped CuSCN thin film transistor: synthesis and optoelectronic characterization study

2019 ◽  
Vol 7 (46) ◽  
pp. 14543-14554 ◽  
Author(s):  
Sadia Baig ◽  
Arthur D. Hendsbee ◽  
Pankaj Kumar ◽  
Safeer Ahmed ◽  
Yuning Li
Keyword(s):  
Thin Film ◽  
Thin Film Transistor ◽  
Hole Mobility ◽  
Characterization Study ◽  
Transparent Thin Film Transistor

A transparent thin film transistor of yttrium-doped CuSCN has been devised with a remarkable hole mobility of 0.99 cm2 V−1 s−1.

Well-defined, high molecular weight poly(3-alkylthiophene)s in thin-film transistors: side chain invariance in field-effect mobility

2010 ◽  
Vol 20 (16) ◽  
pp. 3195 ◽  
Author(s):  
Geneviève Sauvé ◽  
Anna E. Javier ◽  
Rui Zhang ◽  
Junying Liu ◽  
Stefanie A. Sydlik ◽  
...  
Keyword(s):  
Thin Film ◽  
Molecular Weight ◽  
High Molecular Weight ◽  
Thin Film Transistors ◽  
Field Effect ◽  
Side Chain ◽  
Field Effect Mobility ◽  
High Molecular Weight Poly

scholarly journals A-π-D-π-A-Based Small Molecules for OTFTs Containing Diketopyrrolopyrrole as Acceptor Units

Micromachines ◽  
2021 ◽  
Vol 12 (7) ◽  
pp. 817
Author(s):  
Baji Shaik ◽  
Mujeeb Khan ◽  
Mohammed Rafi Shaik ◽  
Mohammed A.F. Sharaf ◽  
Doumbia Sekou ◽  
...  
Keyword(s):  
Thin Film ◽  
Thermal Properties ◽  
Small Molecules ◽  
Thin Film Transistor ◽  
Hole Mobility ◽  
Organic Thin Film ◽  
Organic Thin Film Transistor ◽  
Cast Films ◽  
Donor Acceptor ◽  
P Type

A-π-D-π-A-based small molecules 6,6′-((thiophene-2,5-diylbis(ethyne-2,1-diyl))bis(thiophene-5,2-diyl))bis(2,5-bis(2-ethylhexyl)-3-(thiophen-2-yl)-2,5-dihydropyrrolo[3,4-c]pyrrole-1,4-dione) (TDPP-T) and 6,6′-(((2,3-dihydrothieno[3,4-b][1,4]dioxine-5,7-diyl)bis(ethyne-2,1-diyl))bis(thiophene-5,2-diyl))bis(2,5-bis(2-ethylhexyl)-3-(thiophen-2-yl)-2,5-dihydropyrrolo[3,4-c]pyrrole-1,4-dione) (TDPP-EDOT) have been designed and synthesized. The diketopyrrolopyrrole acts as an electron acceptor, while the thiophene or 3,4-ethylenedioxythiophene acts as an electron donor. The donor–acceptor groups are connected by an ethynyl bridge to further enhance the conjugation. The optoelectronics, electrochemical, and thermal properties have been investigated. Organic thin film transistor (OTFT) devices prepared from TDPP-T and TDPP-EDOT have shown p-type mobility. In as cast films, TDPP-T and TDPP-EDOT have shown a hole mobility of 5.44 × 10−6 cm2 V−1 s−1 and 4.13 × 10−6 cm2 V−1 s−1, respectively. The increase in the mobility of TDPP-T and TDPP-EDOT OTFT devices was observed after annealing at 150 °C, after which the mobilities were 3.11 × 10−4 cm2 V−1 s−1 and 2.63 × 10−4 cm2 V−1 s−1, respectively.

scholarly journals High Performance P-Type Perovskite Lagao3 Thin Film Field Effect Transistor Prepared by Solution-Processed

2022 ◽  
Vol 2152 (1) ◽  
pp. 012008
Author(s):  
Qian Chen
Keyword(s):  
Thin Film ◽  
High Performance ◽  
Low Cost ◽  
Thin Film Transistor ◽  
Solution Process ◽  
Hole Mobility ◽  
Oxide Semiconductor ◽  
Future Design ◽  
Different Temperatures ◽  
P Type

Abstract Metal oxide semiconductor (MOS) is essential to compose high-performance electronic devices, however, the investigation on p-type MOS is relatively rare compared with its n-type counterpart. In this work, LaGaO3 thin films with superior p-type conductivity have been prepared via a facile solution process. Moreover, we have implemented Al2O3 and SiO2 as the dielectric of the p-channel LaGaO3 thin film transistors (TFTs) annealed at different temperatures. Particularly, the LaGaO3/Al2O3 TFTs annealed at 700 °C exhibit an ultrahigh hole mobility of 12.4 cm2V-1s-1, Under the same conditions, LaGaO3/Al2O3 thin film transistor is two orders of magnitude higher than LaGaO3/SiO2 thin film transistor. The advanced p-type characteristics of the LaGaO3 thin film, along with its facile low-cost fabrication process can shed new light on future design of high-performance complementary MOS circuit with other optimized facile-integrated dielectrics.

scholarly journals Temperature dependant structural changes in thin films of random semifluorinated PMMA copolymers

2013 ◽  
Vol 28 (S2) ◽  
pp. S144-S160 ◽  
Author(s):  
Dieter Jehnichen ◽  
Peter Friedel ◽  
Romy Selinger ◽  
Andreas Korwitz ◽  
Martin Wengenmayr ◽  
...  
Keyword(s):  
Thin Films ◽  
Phase Separation ◽  
Structural Changes ◽  
Bulk Material ◽  
Fluorine Content ◽  
Film Surface ◽  
Phase Behaviour ◽  
Side Chain ◽  
Side Chains ◽  
Polymer Backbone

Semifluorinated (SF) side chain polymers show phase separation between polymer backbone and SF side chains. Due to strong interaction between SF segments the side chains determine the structure behaviour strongly, often resulting in layered structures in which backbones and layers of SF side chains alternate. The interest in this work was directed to find out the dependence of these structures on concentration of SF side chains. Thin films of random copolymers consisting of methylmethacrylate (MMA) and semifluorinated side chain methacrylate (SFMA) segments and with different fluorine content in the perfluoroalkyl side chains (abbreviated as H10F10 and H2F8) were prepared by spin-coating. Phase separation and structure changes were initiated by external subsequent annealing. Corresponding bulk material served as basic information. Generation of ordered structures and variation of film parameters were observed using different X-ray scattering methods (XRR, GIWAXS, and GISAXS). The phase behaviour in bulk is governed by the SF side chain amount and their specific fluorine content which control the self-organization tendency of SF side chains. Additionally, the confinement in thin films generates an orientation of side chains normally to film surface.

Influence of side chain length and bifurcation point on the crystalline structure and charge transport of diketopyrrolopyrrole-quaterthiophene copolymers (PDQTs)

2014 ◽  
Vol 2 (12) ◽  
pp. 2183-2190 ◽  
Author(s):  
Shaoyun Chen ◽  
Bin Sun ◽  
Wei Hong ◽  
Hany Aziz ◽  
Yuezhong Meng ◽  
...  
Keyword(s):  
Charge Transport ◽  
Chain Length ◽  
Crystalline Structure ◽  
Bifurcation Point ◽  
Hole Mobility ◽  
Side Chain ◽  
Polymer Backbone ◽  
Side Chain Length

Increasing the side chain length and positioning the bifurcation point away from the polymer backbone improve the hole mobility of a DPP polymer to 6.90 cm2 V−1 s−1.

Naphthodithiophene-Diketopyrrolopyrrole Small Molecule Donors for Efficient Solution-Processed Solar Cells

2012 ◽  
Vol 1390 ◽  
Author(s):  
Stephen Loser ◽  
Carson J. Bruns ◽  
Hiroyuki Miyauchi ◽  
Rocío Ponce Ortiz ◽  
Antonio Facchetti ◽  
...  
Keyword(s):  
Solar Cells ◽  
Small Molecule ◽  
Electron Acceptor ◽  
Efficient Solution ◽  
Power Conversion ◽  
Hole Mobility ◽  
Side Chain ◽  
Device Performance ◽  
Visible Absorption ◽  
Selection Of

ABSTRACTWe report the synthesis, characterization, and implementation of various naphtho[2,3- b:6,7-b’]dithiophene (NDT)-based donor molecules for organic photovoltaics (OPVs) When NDT(TDPP)2 (TDPP = thiophene-capped diketopyrrolopyrrole) contains all branched 2- ethylhexyl chains and is combined with the electron acceptor PC61BM, a power conversion efficiency (PCE) of 4.06±0.6% is achieved. This respectable PCE is attributed to the broad, high oscillator strength visible absorption, the ordered molecular packing, and a high hole mobility of 0.04 cm2·V-1·s-1. We find utilizing linear C-12 side chains on either the TDPP or NDT framework dramatically increases the d-spacing, which directly correlates with inferior OPV device performance. This leads to the conclusion that the selection of an appropriate side chain plays a key role in determining OPV device performance of a small molecule donor.

Enhancing the organic thin-film transistor performance of diketopyrrolopyrrole–benzodithiophene copolymers via the modification of both conjugated backbone and side chain

2015 ◽  
Vol 6 (30) ◽  
pp. 5369-5375 ◽  
Author(s):  
Zhengran Yi ◽  
Lanchao Ma ◽  
Ping Li ◽  
Long Xu ◽  
Xiaowei Zhan ◽  
...  
Keyword(s):  
Thin Film ◽  
Thin Film Transistor ◽  
Side Chain ◽  
Organic Thin Film ◽  
Organic Thin Film Transistor ◽  
Synthetic Strategy ◽  
Bulky Side Chain

A synthetic strategy for enhancing the OTFT performance of DPP–BDT copolymers is developed through the tuning of the bulky side chain position and modification of the conjugated backbone.

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