$2Dexcitonmode

$2Dexcitonmode is the command to decide the exciton diffusion mode. This solver solves exiciton diffusion and coupling equation. The equation to solver is as follow:

S: singlet density (1)
T: triplet density (2)
D: doublet density (3)
 $\frac{d S}{d t} = - D_{s} \nabla^{2} S - (K r + K n r + K e n q_{s} \cdot n + K e p q_{s} \cdot p + K e t_{R 12} + K e t_{R 13}) S - (K e e a_{S} + K e e_{12} + K e e_{13}) \cdot S^{2} + K e t_{R 21} \cdot T + K e t_{R 31} \cdot D + K e e_{21} \cdot T^{2} + K e e_{31} \cdot D^{2} + R a d G_{S} + n o n R a d G_{S}$ 
 $\frac{d T}{d t} = - D_{T} \nabla^{2} T - (K r + K n r + K e n q_{T} \cdot n + K e p q_{T} \cdot p + K e t_{R 21} + K e t_{R 23}) T - (K e e a_{T} + K e e_{21} + K e e_{23}) \cdot T^{2} + K e t_{R 12} \cdot S + K e t_{R 32} \cdot D + K e e_{12} \cdot S^{2} + K e e_{32} \cdot D^{2} + R a d G_{T} + n o n R a d G_{S}$ 
 $\frac{d D}{d t} = - D_{D} \nabla^{2} D - (K r + K n r + K e n q_{D} \cdot n + K e p q_{D} \cdot p + K e t_{R 31} + K e t_{R 32}) D - (K e e a_{D} + K e e_{31} + K e e_{32}) \cdot D^{2} + K e t_{R 21} \cdot T + K e t_{R 13} \cdot D + K e e_{13} \cdot S^{2} + K e e_{23} \cdot T^{2} + R a d G_{D} + n o n R a d G_{S}$

The command is as follows:

 $2Dexcitonmode
 Mode_id  excitontype

For example:

 $2Dexcitonmode
 1 1

Mode_id :  1. The traditional mode, only considersa  single exciton type  
Mode_id :  2.  multiexciton mode update to 3  (excitontype =1 to 3)

Excitontype ID = 1 :   1 exciton type   (such as only considering Singlet, or triplet) 
Excitontype ID = 2 :   2 exciton types   (such as both considering Singlet, and triplet) 
Excitontype ID = 3 :   3 exciton types   (such as considering Singlet, triplet, and doublet or something else)

If mode =2 , the way for $2Dexcitonpar command need to be changed.

 $2Dexcitonmode
 2 2

 $2Dexcitonpar
 20 
 (Dn Kr Knr EEA KEnQ KEpQ  RadG nonRadG  Ketr12  KEE12 )_set1 (  Dn Kr Knr EEA KEnQ KEpQ RadG nonRadG Ketr21 KEE21)_set2

or

 $2Dexcitonmode
 2 3

 $2Dexcitonpar
 36
 (Dn Kr Knr EEA KEnQ KEpQ  RadG nonRadG Ketr12 KEE12 Ketr13 KEE13)_set1 (  Dn Kr Knr EEA KEnQ KEpQ RadG nonRadG Ketr21 KEE21 Ketr23 KEE23)_set2   (  Dn Kr Knr EEA KEnQ KEpQ  RadG nonRadG Ketr31  KEE31 Ketr32 KEE32)_set3  
 Dn    means the exciton diffusion coefficient
 Kr    means exciton recombination 
 Knr means exciton nonradiative recombination 
 EEA   means exciton exciton anealing 
 KEnQ  means exciton electron quench
 KEpQ  means exciton hole quench
 Ketr21 means exciton transfer from 2 to 1  
 Ketr32 means exciton transfer from 3 to 2   ....
 KEE12   means exciton-exciton fusion transfer from 1 to 2 
 KEE23   means exciton-exciton fusion transfer from 2 to 3
 RadG  (0-1.0)  means  Bnp ratio to the generation of an exciton 
 nonRadG  (0-1.0)  means  SRH recombination (trap-assisted) to the generation of an exciton

$2Dexcitonmode $2Dexcitonpar

$2Dexcitonmode

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