scholarly journals Open-shell Donors and Closed-shell Acceptors in Organic Solar Cells

2021 ◽  
Author(s):  
Zhongxin Chen ◽  
Yuan Li ◽  
Wenqiang Li ◽  
Weiya Zhu ◽  
Miao Zeng ◽  
...  
Keyword(s):  
Solar Cells ◽  
Electron Spin Resonance ◽  
Electron Spin ◽  
Organic Solar Cells ◽  
Ground State ◽  
Variable Temperature ◽  
Closed Shell ◽  
Open Shell ◽  
Singlet Ground State ◽  
Spin Resonance

The active materials of organic solar cells are widely recognized to show closed-shell singlet ground state and their electron spin resonance signals are attributed to the defects and impurities. Herein, we disclose the inherent open-shell singlet ground state of donors and the closed-shell structure of acceptors via the combination of variable temperature NMR, electron spin resonance, superconducting quantum interference device and theoretical calculation, providing a new perspective to understand the intrinsic molecular structure in organic solar cells.

scholarly journals Open-shell Donors and Closed-shell Acceptors in Organic Solar Cells

2021 ◽  
Author(s):  
Zhongxin Chen ◽  
Yuan Li ◽  
Wenqiang Li ◽  
Weiya Zhu ◽  
Miao Zeng ◽  
...  
Keyword(s):  
Solar Cells ◽  
Electron Spin Resonance ◽  
Electron Spin ◽  
Organic Solar Cells ◽  
Ground State ◽  
Variable Temperature ◽  
Closed Shell ◽  
Open Shell ◽  
Singlet Ground State ◽  
Spin Resonance

The active materials of organic solar cells are widely recognized to show closed-shell singlet ground state and their electron spin resonance signals are attributed to the defects and impurities. Herein, we disclose the inherent open-shell singlet ground state of donors and the closed-shell structure of acceptors via the combination of variable temperature NMR, electron spin resonance, superconducting quantum interference device and theoretical calculation, providing a new perspective to understand the intrinsic molecular structure in organic solar cells.

ELECTRON-SPIN RESONANCE EVIDENCE OF THE QUANTUM SPIN GAP IN THE LiCu2O2

2002 ◽  
Vol 16 (20n22) ◽  
pp. 3373-3376
Author(s):  
S. A. ZVYAGIN ◽  
G. CAO ◽  
L.-C. BRUNEL ◽  
J. CROW
Keyword(s):  
Electron Spin Resonance ◽  
Electron Spin ◽  
Ground State ◽  
Quantum Spin ◽  
Electron Spin Resonance Study ◽  
Singlet Ground State ◽  
Excited Triplet ◽  
Spin Singlet ◽  
Spin Resonance ◽  
Spin Resonance Study

Results of the high-frequency/field electron spin resonance investigation of the quantum S = 1/2 chain compound LiCu2O2 are presented. Spin-singlet ground state (which occurs in LiCu2O2 as a result of the spin-dimerization) is revealed at a temperature above T ~ 23 K. The size of the gap between the spin-singlet ground state and the excited triplet is found to be Δ = 72 K. Electron spin resonance study confirms a magnetic phase transition in LiCu2O2, which results in the collapse of the spin-singlet ground state at T < 23 K.

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