Design and synthesis of new ultra-low band gap thiadiazoloquinoxaline-based polymers for near-infrared organic photovoltaic application

RSC Advances ◽  
2016 ◽  
Vol 6 (18) ◽  
pp. 14893-14908 ◽  
Author(s):  
M. L. Keshtov ◽  
S. A. Kuklin ◽  
N. A. Radychev ◽  
A. Yu. Nikolaev ◽  
E. N. Koukaras ◽  
...  
Keyword(s):  
Band Gap ◽  
Near Infrared ◽  
Organic Photovoltaic ◽  
Low Band Gap ◽  
Design And Synthesis ◽  
Photovoltaic Application

Two D–A copolymers, F1 and F2, with fluorene and thiazole units were substituted, respectively, on a thiadiazoloquinoxaline (TDQ) unit to enhance the electron-accepting strength of TDQ.

scholarly journals Design and synthesis of low band gap non-fullerene acceptors for organic solar cells with impressively high Jsc over 21 mA cm_2

2017 ◽  
Vol 60 (9) ◽  
pp. 819-828 ◽  
Author(s):  
Huan-Huan Gao ◽  
Yanna Sun ◽  
Xiangjian Wan ◽  
Bin Kan ◽  
Xin Ke ◽  
...  
Keyword(s):  
Solar Cells ◽  
Band Gap ◽  
Organic Solar Cells ◽  
Low Band Gap ◽  
Design And Synthesis

Design and Synthesis of a Low Band Gap Conjugated Macroinitiator:  Toward Rod−Coil Donor−Acceptor Block Copolymers

2006 ◽  
Vol 39 (13) ◽  
pp. 4289-4297 ◽  
Author(s):  
Karin Van De Wetering ◽  
Cyril Brochon ◽  
Chheng Ngov ◽  
Georges Hadziioannou
Keyword(s):  
Block Copolymers ◽  
Band Gap ◽  
Low Band Gap ◽  
Design And Synthesis ◽  
Donor Acceptor

Fluorinated Benzoselenadiazole-Based Low-Band-Gap Polymers for High Efficiency Inverted Single and Tandem Organic Photovoltaic Cells

2014 ◽  
Vol 47 (5) ◽  
pp. 1613-1622 ◽  
Author(s):  
Ji-Hoon Kim ◽  
Seung Ah Shin ◽  
Jong Baek Park ◽  
Chang Eun Song ◽  
Won Suk Shin ◽  
...  
Keyword(s):  
Band Gap ◽  
High Efficiency ◽  
Photovoltaic Cells ◽  
Organic Photovoltaic ◽  
Organic Photovoltaic Cells ◽  
Low Band Gap ◽  
Low Band Gap Polymers

scholarly journals Ultrafast Charge and Triplet State Formation in Diketopyrrolopyrrole Low Band Gap Polymer/Fullerene Blends: Influence of Nanoscale Morphology of Organic Photovoltaic Materials on Charge Recombination to the Triplet State

2017 ◽  
Vol 2017 ◽  
pp. 1-16 ◽  
Author(s):  
René M. Williams ◽  
Hung-Cheng Chen ◽  
Daniele Di Nuzzo ◽  
Stephan C. J. Meskers ◽  
René A. J. Janssen
Keyword(s):  
Triplet State ◽  
Band Gap ◽  
State Formation ◽  
Laser Fluence ◽  
Charge Recombination ◽  
Organic Photovoltaic ◽  
Low Band Gap ◽  
Photovoltaic Materials ◽  
Organic Photovoltaic Materials ◽  
Low Band Gap Polymer

Femtosecond transient absorption spectroscopy of thin films of two types of morphologies of diketopyrrolopyrrole low band gap polymer/fullerene-adduct blends is presented and indicates triplet state formation by charge recombination, an important loss channel in organic photovoltaic materials. At low laser fluence (approaching solar intensity) charge formation characterized by a 1350 nm band (in ~250 fs) dominates in the two PDPP-PCBM blends with different nanoscale morphologies and these charges recombine to form a local polymer-based triplet state on the sub-ns timescale (in ~300 and ~900 ps) indicated by an 1100 nm absorption band. The rate of triplet state formation is influenced by the morphology. The slower rate of charge recombination to the triplet state (in ~900 ps) belongs to a morphology that results in a higher power conversion efficiency in the corresponding device. Nanoscale morphology not only influences interfacial area and conduction of holes and electrons but also influences the mechanism of intersystem crossing (ISC). We present a model that correlates morphology to the exchange integral and fast and slow mechanisms for ISC (SOCT-ISC and H-HFI-ISC). For the pristine polymer, a flat and unstructured singlet-singlet absorption spectrum (between 900 and 1400 nm) and a very minor triplet state formation (5%) are observed at low laser fluence.

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