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윤제정 ( Je Jung Yun ),이재욱 ( Jae Wook Lee ),한은미 ( Eun Mi Han ) 조선대학교 공학기술연구원 2008 공학기술논문지 Vol.1 No.2
So far, as a electron donor Poly (3-hcxyl-thiophene) (P3HT) and acceptor [6,6]-phenyl-C61 butyric acid methyl ester (PCBM) are the best combination in the bulk heterojunction organic semiconducting solar cell. P3HT based organic solar cell has much attractive to offer important technological potential advances owing to its advantageous properties: electron rich, high charge carrier mobility, relatively small band gap (~2.l eV), relatively good thermal stability, soluble in organic solvent and etc. In this paper, photovoltaic effects are directly affected by the active layer thickness which proportional to the series resistance. Another characteristics are inverse portional to the shunt resistance, short circuit current and fill factor with increase of active layer thickness: 240 nm(1 wt%), 430 nm(2 wt%), 720 nm(3 wt%), 895 nm(4 wt%) and 1095 nm(5 wt%). Active layer were blended with P3HT and PCBM. The highest photon to current conversion efficiency was the one which active layer thickness was 240nm. These result could be driven that the optimum condition of high efficiency strongly related the limitation factors of absorption of photons and electron path as resistances.