A highly crystalline low band-gap polymer consisting of perylene and diketopyrrolopyrrole for organic photovoltaic cells

2013 ◽  
Vol 49 (31) ◽  
pp. 3248 ◽  
Author(s):  
Ji-Hoon Kim ◽  
Chang Eun Song ◽  
In-Nam Kang ◽  
Won Suk Shin ◽  
Do-Hoon Hwang
Keyword(s):  
Band Gap ◽  
Photovoltaic Cells ◽  
Organic Photovoltaic ◽  
Organic Photovoltaic Cells ◽  
Low Band Gap ◽  
Low Band Gap Polymer

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

Low band-gap conjugated polymer based on diketopyrrolopyrrole units and its application in organic photovoltaic cells

2017 ◽  
Vol 5 (21) ◽  
pp. 10416-10423 ◽  
Author(s):  
Hao Zhang ◽  
Shaoqing Zhang ◽  
Ke Gao ◽  
Feng Liu ◽  
Huifeng Yao ◽  
...  
Keyword(s):  
Solar Cells ◽  
Band Gap ◽  
Conjugated Polymer ◽  
Polymer Solar Cells ◽  
Photovoltaic Cells ◽  
Organic Photovoltaic ◽  
Organic Photovoltaic Cells ◽  
Low Band Gap

A new conjugated polymer utilizing diketopyrrolopyrrole (DPP) and benzo[1,2-c:4,5-c′]dithiophene-4,8-dione (BDD) units as the backbone framework was designed, synthesized, and applied in polymer solar cells.

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.

Stability study of low and high band gap polymer and air stability of PTB7:PC71BM bulk heterojunction organic photovoltaic cells with encapsulation technique

2015 ◽  
Vol 209 ◽  
pp. 348-354 ◽  
Author(s):  
Tarek M. Abdel-Fattah ◽  
Enas M. Younes ◽  
Gon Namkoong ◽  
E.M. El-Maghraby ◽  
Adly H. Elsayed ◽  
...  
Keyword(s):  
Band Gap ◽  
Bulk Heterojunction ◽  
Photovoltaic Cells ◽  
Stability Study ◽  
Organic Photovoltaic ◽  
Organic Photovoltaic Cells ◽  
High Band
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