Device-Based Probe of Triplet Exciton Diffusion in Singlet Fission Materials

2021 ◽  
Vol 12 (3) ◽  
pp. 966-972
Author(s):  
Tao Zhang ◽  
Deepesh Rai ◽  
Russell J. Holmes
Keyword(s):  
Triplet Exciton ◽  
Singlet Fission ◽  
Exciton Diffusion

scholarly journals A method to detect triplet exciton transfer from singlet fission materials into silicon solar cells: Comparing different surface treatments

2020 ◽  
Vol 152 (11) ◽  
pp. 114201 ◽  
Author(s):  
Benjamin Daiber ◽  
Sidharam P. Pujari ◽  
Steven Verboom ◽  
Stefan L. Luxembourg ◽  
Stefan W. Tabernig ◽  
...  
Keyword(s):  
Solar Cells ◽  
Surface Treatments ◽  
Triplet Exciton ◽  
Silicon Solar Cells ◽  
Singlet Fission ◽  
Exciton Transfer

scholarly journals Fast and long-range triplet exciton diffusion in metal–organic frameworks for photon upconversion at ultralow excitation power

2015 ◽  
Vol 14 (9) ◽  
pp. 924-930 ◽  
Author(s):  
Prasenjit Mahato ◽  
Angelo Monguzzi ◽  
Nobuhiro Yanai ◽  
Teppei Yamada ◽  
Nobuo Kimizuka
Keyword(s):  
Long Range ◽  
Metal Organic Frameworks ◽  
Excitation Power ◽  
Triplet Exciton ◽  
Exciton Diffusion ◽  
Metal Organic

Singlet and Triplet Exciton Diffusion in a Self-Organizing Porphyrin Antenna Layer

2004 ◽  
Vol 14 (10) ◽  
pp. 992-998 ◽  
Author(s):  
J. E. Kroeze ◽  
R. B. M. Koehorst ◽  
T. J. Savenije
Keyword(s):  
Triplet Exciton ◽  
Exciton Diffusion ◽  
Self Organizing

Effect of a sensing layer on triplet exciton diffusion in organic films

2007 ◽  
Vol 75 (13) ◽  
Author(s):  
Y. C. Zhou ◽  
L. L. Ma ◽  
J. Zhou ◽  
X. M. Ding ◽  
X. Y. Hou
Keyword(s):  
Triplet Exciton ◽  
Organic Films ◽  
Exciton Diffusion

Anisotropic Triplet Exciton Diffusion in Crystalline Functionalized Pentacene

2020 ◽  
Vol 124 (43) ◽  
pp. 23541-23550
Author(s):  
Rohan J. Hudson ◽  
David M. Huang ◽  
Tak W. Kee
Keyword(s):  
Triplet Exciton ◽  
Exciton Diffusion

scholarly journals Singlet fission of hot excitons in π -conjugated polymers

2015 ◽  
Vol 373 (2044) ◽  
pp. 20140327 ◽  
Author(s):  
Yaxin Zhai ◽  
Chuanxiang Sheng ◽  
Z. Valy Vardeny
Keyword(s):  
Conjugated Polymers ◽  
Threshold Energy ◽  
High Energy ◽  
Triplet Exciton ◽  
Singlet Fission ◽  
General Process ◽  
Singlet Exciton ◽  
Triplet Pair ◽  
Luminescent Polymer ◽  
Pair State

We used steady-state photoinduced absorption (PA), excitation dependence (EXPA( ω )) spectrum of the triplet exciton PA band, and its magneto-PA (MPA( B )) response to investigate singlet fission (SF) of hot excitons into two separated triplet excitons, in two luminescent and non-luminescent π -conjugated polymers. From the high energy step in the triplet EXPA( ω ) spectrum of the luminescent polymer poly(dioctyloxy)phenylenevinylene (DOO-PPV) films, we identified a hot-exciton SF (HE-SF) process having threshold energy at E ≈2 E T (=2.8 eV, where E T is the energy of the lowest lying triplet exciton), which is about 0.8 eV above the lowest singlet exciton energy. The HE-SF process was confirmed by the triplet MPA( B ) response for excitation at E >2 E T , which shows typical SF response. This process is missing in DOO-PPV solution, showing that it is predominantly interchain in nature. By contrast, the triplet EXPA( ω ) spectrum in the non-luminescent polymer polydiacetylene (PDA) is flat with an onset at E = E g (≈2.25 eV). From this, we infer that intrachain SF that involves a triplet–triplet pair state, also known as the ‘dark’ 2A g exciton, dominates the triplet photogeneration in PDA polymer as E g >2 E T . The intrachain SF process was also identified from the MPA( B ) response of the triplet PA band in PDA. Our work shows that the SF process in π -conjugated polymers is a much more general process than thought previously.

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