Identification of Ultrafast Relaxation Processes As a Major Reason for Inefficient Exciton Diffusion in Perylene-Based Organic Semiconductors

2014 ◽  
Vol 136 (26) ◽  
pp. 9327-9337 ◽  
Author(s):  
Volker Settels ◽  
Alexander Schubert ◽  
Maxim Tafipolski ◽  
Wenlan Liu ◽  
Vera Stehr ◽  
...  
Keyword(s):  
Organic Semiconductors ◽  
Relaxation Processes ◽  
Exciton Diffusion ◽  
Ultrafast Relaxation

scholarly journals Ultrafast Relaxation Processes of Photosynthetic Carotenoids

2004 ◽  
Vol 32 (11) ◽  
pp. 701-710
Author(s):  
Hideki HASHIMOTO ◽  
Tokutake SASHIMA ◽  
Kazuhiro YANAGI ◽  
Masayuki YOSHIZAWA
Keyword(s):  
Relaxation Processes ◽  
Ultrafast Relaxation

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.

Observation of long-range exciton diffusion in highly ordered organic semiconductors

2010 ◽  
Vol 9 (11) ◽  
pp. 938-943 ◽  
Author(s):  
H. Najafov ◽  
B. Lee ◽  
Q. Zhou ◽  
L. C. Feldman ◽  
V. Podzorov
Keyword(s):  
Long Range ◽  
Organic Semiconductors ◽  
Exciton Diffusion

scholarly journals Time-resolved luminescence spectroscopy by the optical Kerr-gate method applicable to ultrafast relaxation processes

2000 ◽  
Vol 62 (15) ◽  
pp. 10083-10087 ◽  
Author(s):  
J. Takeda ◽  
K. Nakajima ◽  
S. Kurita ◽  
S. Tomimoto ◽  
S. Saito ◽  
...  
Keyword(s):  
Luminescence Spectroscopy ◽  
Relaxation Processes ◽  
Time Resolved ◽  
Ultrafast Relaxation ◽  
Optical Kerr Gate

Simultaneous enhancement of charge transport and exciton diffusion in single-crystal-like organic semiconductors

2012 ◽  
Vol 100 (10) ◽  
pp. 103305 ◽  
Author(s):  
Jianbing Yang ◽  
Feng Zhu ◽  
Bo Yu ◽  
Haibo Wang ◽  
Donghang Yan
Keyword(s):  
Single Crystal ◽  
Charge Transport ◽  
Organic Semiconductors ◽  
Exciton Diffusion
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