Measurement of the triplet exciton diffusion length in organic semiconductors

2019 ◽  
Vol 7 (19) ◽  
pp. 5695-5701 ◽  
Author(s):  
Deepesh Rai ◽  
Russell J. Holmes
Keyword(s):  
Thin Films ◽  
Organic Semiconductors ◽  
Organic Semiconductor ◽  
Diffusion Length ◽  
Triplet Exciton ◽  
Exciton Diffusion ◽  
Exciton Diffusion Length ◽  
Semiconductor Thin Films ◽  
Quenching Efficiency ◽  
Triplet Excitons

We develop a methodology to measure the diffusion of dark triplet excitons in organic semiconductor thin films using a phosphorescent sensitizer-based approach that explicitly quantifies quenching efficiency by varying sensitizer concentration.

The effects of heavy atoms on the exciton diffusion properties in photoactive thin films of tetrakis(4-carbomethoxyphenyl)porphyrins

2015 ◽  
Vol 3 (6) ◽  
pp. 1243-1249 ◽  
Author(s):  
Angy L. Ortiz ◽  
Graham S. Collier ◽  
Dawn M. Marin ◽  
Jennifer A. Kassel ◽  
Reynolds J. Ivins ◽  
...  
Keyword(s):  
Thin Films ◽  
Monte Carlo ◽  
Diffusion Coefficient ◽  
Diffusion Length ◽  
Heavy Atoms ◽  
Exciton Diffusion ◽  
Exciton Diffusion Length ◽  
Quenching Efficiency ◽  
Diffusion Properties

The exciton diffusion coefficient (D) and exciton diffusion length (LD) for three tetrakis(4-carbomethoxyphenyl)porphyrins were obtained by fitting the quenching efficiency and PL lifetime to a 3D exciton Monte Carlo ediffusion model.

scholarly journals Long-range exciton diffusion in molecular non-fullerene acceptors

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Yuliar Firdaus ◽  
Vincent M. Le Corre ◽  
Safakath Karuthedath ◽  
Wenlan Liu ◽  
Anastasia Markina ◽  
...  
Keyword(s):  
Organic Semiconductors ◽  
Diffusion Length ◽  
Crystal Packing ◽  
Maximum Size ◽  
Exciton Diffusion ◽  
Exciton Diffusion Length ◽  
Donor And Acceptor ◽  
Wide Range ◽  
20 Nm ◽  
End Group

Abstract The short exciton diffusion length associated with most classical organic semiconductors used in organic photovoltaics (5-20 nm) imposes severe limits on the maximum size of the donor and acceptor domains within the photoactive layer of the cell. Identifying materials that are able to transport excitons over longer distances can help advancing our understanding and lead to solar cells with higher efficiency. Here, we measure the exciton diffusion length in a wide range of nonfullerene acceptor molecules using two different experimental techniques based on photocurrent and ultrafast spectroscopy measurements. The acceptors exhibit balanced ambipolar charge transport and surprisingly long exciton diffusion lengths in the range of 20 to 47 nm. With the aid of quantum-chemical calculations, we are able to rationalize the exciton dynamics and draw basic chemical design rules, particularly on the importance of the end-group substituent on the crystal packing of nonfullerene acceptors.

Organic semiconductor core–shell nanoparticles designed through successive solvent displacements

2014 ◽  
Vol 1 (4) ◽  
pp. 431-438 ◽  
Author(s):  
Sylvain Chambon ◽  
Christophe Schatz ◽  
Vivien Sébire ◽  
Bertrand Pavageau ◽  
Guillaume Wantz ◽  
...  
Keyword(s):  
Steady State ◽  
Organic Semiconductor ◽  
Diffusion Length ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Exciton Diffusion ◽  
Exciton Diffusion Length ◽  
Core Shell Nanoparticles

The concept of sequential nanoprecipitation is developed to generate organic semiconductor core–shell nanoparticles with P3HT core and PCBM shell. Steady-state photoluminescence experiments on such nanoparticles enable the estimation of the exciton diffusion length at ∼14 nm.

Role of impurities in determining the exciton diffusion length in organic semiconductors

2016 ◽  
Vol 108 (16) ◽  
pp. 163301 ◽  
Author(s):  
Ian J. Curtin ◽  
D. Wayne Blaylock ◽  
Russell J. Holmes
Keyword(s):  
Organic Semiconductors ◽  
Diffusion Length ◽  
Exciton Diffusion ◽  
Exciton Diffusion Length

Evaluating the role of energetic disorder and thermal activation in exciton transport

2016 ◽  
Vol 4 (16) ◽  
pp. 3437-3442 ◽  
Author(s):  
S. Matthew Menke ◽  
Russell J. Holmes
Keyword(s):  
Organic Semiconductors ◽  
Thermal Activation ◽  
Diffusion Length ◽  
Temperature Dependent ◽  
Exciton Diffusion ◽  
Exciton Diffusion Length ◽  
Exciton Transport ◽  
Energetic Disorder ◽  
Boron Subphthalocyanine

Temperature dependent measurements of the exciton diffusion length (LD) are performed for three archetypical small-molecule, organic semiconductors: aluminum tris-(8-hydroxyquinoline) (Alq3), dicyanovinyl-terthiophene (DCV3T), and boron subphthalocyanine chloride (SubPc).

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