Open AccessInvestigation on the effect of cathode work function and exciton generation rate on the open-circuit voltage of single layer organic solar cell with Schottky contact
Author(s) -
Ronghua Li,
Meng Wei-min,
Yingquan Peng,
Chensheng Ma,
Runsheng Wang,
Huaqing Xie,
Ying Wang,
Zao-chen Ye
Publication year - 2010
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.59.2126
Subject(s) - open circuit voltage , work function , cathode , materials science , saturation (graph theory) , saturation current , anode , voltage , schottky barrier , organic solar cell , optoelectronics , exciton , short circuit , layer (electronics) , electrical engineering , physics , nanotechnology , condensed matter physics , electrode , composite material , mathematics , engineering , combinatorics , diode , polymer , quantum mechanics
In this articlewe investigate the effect of cathode work functionexciton generation rate and temperature as well as carriers and field distribution in the organic layer on the open-circuit voltage Voc of single layer organic solar cell with Schottky contact by using numerical method. It is demonstrated that the decrease of cathode work function Wc contribute to the increase of open-circuit voltage until Wc is close to the LOMO level of the organic material. The open-circuit voltage reaches a saturation valuewhen Wc is smaller then |EL|and this open-circuit saturation voltage increases with the enhancement of exciton generation rate. For a given anode and cathode work functionthe open-circuit voltage increases with exicton generation rate. When the exciton generation rate reaches a certain valueVoc goes to saturation instead of further increaseand the saturation value equals to the built-in voltage. Additionallythe saturated Voc decreases with the increase of temperatureand the decrease rate reduces with the increase of the exciton generation rate.