scholarly journals Hole‐Transfer Dependence on Blend Morphology and Energy Level Alignment in Polymer: ITIC Photovoltaic Materials

2017 ◽  
Vol 30 (3) ◽  
pp. 1704263 ◽  
Author(s):  
Nicholas D. Eastham ◽  
Jenna L. Logsdon ◽  
Eric F. Manley ◽  
Thomas J. Aldrich ◽  
Matthew J. Leonardi ◽  
...  
Keyword(s):  
Energy Level ◽  
Hole Transfer ◽  
Photovoltaic Materials ◽  
Blend Morphology ◽  
Energy Level Alignment

scholarly journals Ultrafast electron and hole transfer in bulk heterojunctions of low-bandgap polymers

2016 ◽  
Vol 4 (1) ◽  
Author(s):  
Oleg V. Kozlov ◽  
Vlad G. Pavelyev ◽  
Hilde D. de Gier ◽  
Remco W. A. Havenith ◽  
Paul H.M. van Loosdrecht ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Energy Level ◽  
Charge Separation ◽  
Density Functional ◽  
Free Charge ◽  
Charge Generation ◽  
Hole Transfer ◽  
Low Bandgap ◽  
Transfer Processes ◽  
Energy Level Alignment

AbstractIn modern bulk heterojunction (BHJ) organic solar cells, blends of low-bandgap polymer and [70]PCBM acceptor are used in the active layer. In this combination, the polymer absorbs photons from the red and near-IR parts of the solar spectrum, while the blue and near-UV photons are harvested by [70]PCBM. As a result, both electron transfer from polymer to [70]PCBM and hole transfer from [70]PCBM to polymer are of utmost importance in free charge generation and have to be optimized simultaneously. Here we study electron and hole transfer processes in BHJ blends of two low-bandgap polymers, BTT-DPP and PCPDTBT, by ultrafast photoinduced spectroscopy (PIA). By tracking the PIA dynamics, we observed substantially different charge separation pathways in BHJs of the two polymers with [70]PCBM. From the photoinduced anisotropy dynamics, we demonstrated that in the PCPDTBT:[70]PCBM system both electron and hole transfer processes are highly efficient, while in the BTTBPP:[ 70]PCBM electron transfer is blocked due to the unfortunate energy level alignment leaving hole transfer the only pathway to free charge generation. Calculations at the density functional theory level are used to gain more insight into our findings. The presented results highlight the importance of the energy level alignment on the charge separation process.

scholarly journals Energy Level Alignment at the C 60 /Monolayer‐WS 2 Interface on Insulating and Conductive Substrates

2021 ◽  
pp. 2100425
Author(s):  
Jie Ma ◽  
Patrick Amsalem ◽  
Thorsten Schultz ◽  
Dongguen Shin ◽  
Xiaomin Xu ◽  
...  
Keyword(s):  
Energy Level ◽  
Energy Level Alignment ◽  
Conductive Substrates

In-situ analysis energy level alignment at solution processed HAT(CN) 6 /PVK (PVK:TAPC) interface via XPS and UPS

2017 ◽  
Vol 17 (8) ◽  
pp. 1094-1099 ◽  
Author(s):  
N.A. Talik ◽  
B.K. Yap ◽  
C.Y. Tan ◽  
T.J. Whitcher
Keyword(s):  
Energy Level ◽  
In Situ Analysis ◽  
Solution Processed ◽  
Energy Level Alignment

Energy level alignment at Alq/metal interfaces

1998 ◽  
Vol 72 (13) ◽  
pp. 1593-1595 ◽  
Author(s):  
S. T. Lee ◽  
X. Y. Hou ◽  
M. G. Mason ◽  
C. W. Tang
Keyword(s):  
Energy Level ◽  
Energy Level Alignment ◽  
Metal Interfaces

Cation Engineering for Resonant Energy Level Alignment in Two-Dimensional Lead Halide Perovskites

2021 ◽  
pp. 2528-2535
Author(s):  
Nadège Marchal ◽  
Edoardo Mosconi ◽  
Gonzalo García-Espejo ◽  
Tahani M. Almutairi ◽  
Claudio Quarti ◽  
...  
Keyword(s):  
Energy Level ◽  
Two Dimensional ◽  
Resonant Energy ◽  
Energy Level Alignment ◽  
Halide Perovskites ◽  
Lead Halide
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