Why ultrafast charge separation occurs in bulk-heterojunction organic solar cells: a multichain tight binding model study

2021 ◽  
Author(s):  
Yujuan Huang ◽  
Longlong Zhang ◽  
Yuying Hao
Keyword(s):  
Solar Cells ◽  
Quantum Efficiency ◽  
Organic Solar Cells ◽  
Charge Separation ◽  
Bulk Heterojunction ◽  
Internal Quantum Efficiency ◽  
Tight Binding ◽  
Tight Binding Model ◽  
Binding Model ◽  
Model Study

Bulk-heterojunction (BHJ) organic solar cells (OSCs) exhibit the ultrafast charge separation (UCS) ability, enables lowering the geminate charge recombination and achieving the high internal quantum efficiency. Unravelling why UCS occurs...

Semi-Transparent Tandem Organic Solar Cells with 90% Internal Quantum Efficiency

2012 ◽  
Vol 2 (12) ◽  
pp. 1467-1476 ◽  
Author(s):  
Zheng Tang ◽  
Zandra George ◽  
Zaifei Ma ◽  
Jonas Bergqvist ◽  
Kristofer Tvingstedt ◽  
...  
Keyword(s):  
Solar Cells ◽  
Quantum Efficiency ◽  
Organic Solar Cells ◽  
Internal Quantum Efficiency

Enhancing the Internal Quantum Efficiency and Stability of Organic Solar Cells via Metallic Nanofunnels

2015 ◽  
Vol 5 (24) ◽  
pp. 1501393 ◽  
Author(s):  
Se-Woong Baek ◽  
Jong Hun Kim ◽  
Juhoon Kang ◽  
Hyunsoo Lee ◽  
Jeong Young Park ◽  
...  
Keyword(s):  
Solar Cells ◽  
Quantum Efficiency ◽  
Organic Solar Cells ◽  
Internal Quantum Efficiency

Tight-Binding Model Study of Tunneling Spectra of Monolayer Graphene-on-Substrate

2018 ◽  
Vol 17 (04) ◽  
pp. 1760027 ◽  
Author(s):  
Himanshu Sekhar Gouda ◽  
Sivabrata Sahu ◽  
G. C. Rout
Keyword(s):  
Green's Functions ◽  
Green’S Functions ◽  
Tight Binding ◽  
Mean Field Approximation ◽  
Coulomb Energy ◽  
Electron Interaction ◽  
Model Parameters ◽  
Tight Binding Model ◽  
Binding Model ◽  
Model Study

We report here the theoretical model study of antiferromagnetic ordering in graphene. We propose a tight-binding model Hamiltonian describing electron hopping up to third-nearest neighbors in graphene. The Hamiltonian describing inequivalence of [Formula: see text] and [Formula: see text] sublattices in graphene-on-substrate is incorporated. The Hubbard-type repulsive Coulomb interaction is considered for both the sublattices with same Coulomb energy. The electron–electron interaction is considered within mean-field approximation with mean electron occupancies [Formula: see text] at [Formula: see text] sublattice and [Formula: see text] at [Formula: see text] site with [Formula: see text] and [Formula: see text] being the antiferromagnetic magnetizations at [Formula: see text] and [Formula: see text] sublattices, respectively. The total Hamiltonian is solved by Zubarev’s techniques of double time single particle Green’s functions. The magnetizations are calculated from the correlation functions corresponding to the respective Green’s functions. The temperature-dependent magnetizations are solved self-consistently taking suitable grid points for the electron momentum. Finally, the electron density of states (DOS) which is proportional to imaginary part of the electron Green’s functions is calculated and computed numerically at a given temperature varying different model parameters for the system. The conductance spectra show a gap near the Dirac point due to substrate-induced gap and magnetic gap, while the van Hove singularities split into eight peaks due to two different sublattice magnetizations and two different spin orientations of the electron in graphene-on-substrate.

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