Effects of optical interference and energy transfer on exciton diffusion length measurements in organic semiconductors

2006 ◽  
Vol 100 (3) ◽  
pp. 034907 ◽  
Author(s):  
Shawn R. Scully ◽  
Michael D. McGehee
Keyword(s):  
Energy Transfer ◽  
Organic Semiconductors ◽  
Diffusion Length ◽  
Optical Interference ◽  
Exciton Diffusion ◽  
Exciton Diffusion Length ◽  
Length Measurements

Method of determining the exciton diffusion length using optical interference effect in Schottky diode

2009 ◽  
Vol 94 (22) ◽  
pp. 223303 ◽  
Author(s):  
Suman Banerjee ◽  
Anukul Prasad Parhi ◽  
S. Sundar Kumar Iyer ◽  
Satyendra Kumar
Keyword(s):  
Schottky Diode ◽  
Interference Effect ◽  
Diffusion Length ◽  
Optical Interference ◽  
Exciton Diffusion ◽  
Exciton Diffusion Length

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.

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).

Systematic study of exciton diffusion length in organic semiconductors by six experimental methods

2014 ◽  
Vol 1 (2) ◽  
pp. 280-285 ◽  
Author(s):  
Jason D. A. Lin ◽  
Oleksandr V. Mikhnenko ◽  
Jingrun Chen ◽  
Zarifi Masri ◽  
Arvydas Ruseckas ◽  
...  
Keyword(s):  
Organic Semiconductors ◽  
Systematic Study ◽  
Diffusion Length ◽  
Experimental Methods ◽  
Chemical Modifications ◽  
Exciton Diffusion ◽  
Exciton Diffusion Length

Six techniques are used to measure the exciton diffusion length as a function of systematic chemical modifications.

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