Driving Force Dependence of Electron Transfer Kinetics and Yield in Low-Band-Gap Polymer Donor–Acceptor Organic Photovoltaic Blends

2015 ◽  
Vol 119 (23) ◽  
pp. 12829-12837 ◽  
Author(s):  
Brendan F. Wright ◽  
Kenji Sunahara ◽  
Akihiro Furube ◽  
Andrew Nattestad ◽  
Tracey M. Clarke ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Band Gap ◽  
Driving Force ◽  
Organic Photovoltaic ◽  
Electron Transfer Kinetics ◽  
Low Band Gap ◽  
Donor Acceptor ◽  
Low Band Gap Polymer

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.

Ultrafast Electron Transfer in Low-Band Gap Polymer/PbS Nanocrystalline Blend Films

2015 ◽  
Vol 26 (5) ◽  
pp. 713-721 ◽  
Author(s):  
Wenping Guo ◽  
Jianyu Yuan ◽  
Haochen Yuan ◽  
Feng Jin ◽  
Lu Han ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Band Gap ◽  
Low Band Gap ◽  
Blend Films ◽  
Low Band Gap Polymer ◽  
Ultrafast Electron Transfer

Direct arylation synthesis of thienoisoindigo-based low-band-gap polymer from asymmetric donor-acceptor monomer

2017 ◽  
Vol 56 (4) ◽  
pp. 430-436 ◽  
Author(s):  
Kazuhiro Nakabayashi ◽  
Haruka Fukuzawa ◽  
Karin Fujita ◽  
Hideharu Mori
Keyword(s):  
Band Gap ◽  
Direct Arylation ◽  
Low Band Gap ◽  
Donor Acceptor ◽  
Low Band Gap Polymer

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

Synthesis and Characterization of an Anthracene-Based Low Band Gap Polymer for Photovoltaic Devices

2014 ◽  
Vol 14 (8) ◽  
pp. 6422-6426 ◽  
Author(s):  
In Hwan Jung ◽  
Hoyeon Kim ◽  
Wonho Lee ◽  
Byung Jun Jung ◽  
Han Young Woo ◽  
...  
Keyword(s):  
Band Gap ◽  
Synthesis And Characterization ◽  
Photovoltaic Devices ◽  
Low Band Gap ◽  
Low Band Gap Polymer

High photovoltage achieved in low band gap polymer solar cells by adjusting energy levels of a polymer with the LUMOs of fullerene derivatives

2008 ◽  
Vol 18 (45) ◽  
pp. 5468 ◽  
Author(s):  
Fengling Zhang ◽  
Johan Bijleveld ◽  
Erik Perzon ◽  
Kristofer Tvingstedt ◽  
Sophie Barrau ◽  
...  
Keyword(s):  
Solar Cells ◽  
Band Gap ◽  
Polymer Solar Cells ◽  
Energy Levels ◽  
Low Band Gap ◽  
Fullerene Derivatives ◽  
Low Band Gap Polymer
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