Correlation between photoelectric and optical absorption spectra of thermally evaporated pentacene films

被引:103
作者
Lee, J [1 ]
Kim, SS [1 ]
Kim, K [1 ]
Kim, JH [1 ]
Im, S [1 ]
机构
[1] Yonsei Univ, Inst Phys & Appl Phys, Seoul 120749, South Korea
关键词
D O I
10.1063/1.1668328
中图分类号
O59 [应用物理学];
学科分类号
摘要
We have measured the spectral photoresponse of Al/pentacene Schottky junction photodiodes and optical absorption spectra of pentacene films thermally evaporated on glass. The photoelectric response exhibited the genuine highest occupied molecular orbital (HOMO)-lowest unoccupied molecular orbital (LUMO) transition at 1.97 eV and interband absorption peaks at 2.3 and 2.5 eV. These peaks are also identified in the optical absorption spectra, but they are dominated by additional strong exciton peaks at 1.82 and 2.1 eV. By comparing these complementary measurements, we determine the HOMO-LUMO gap energy of 1.97 eV and the fundamental exciton binding energy of 0.15 eV for thin solid pentacene. (C) 2004 American Institute of Physics.
引用
收藏
页码:1701 / 1703
页数:3
相关论文
共 15 条
[1]   Ultrafast on-chain dissociation of hot excitons in conjugated polymers [J].
Arkhipov, VI ;
Emelianova, EV ;
Barth, S ;
Bässler, H .
PHYSICAL REVIEW B, 2000, 61 (12) :8207-8214
[2]   Low-voltage organic transistors on plastic comprising high-dielectric constant gate insulators [J].
Dimitrakopoulos, CD ;
Purushothaman, S ;
Kymissis, J ;
Callegari, A ;
Shaw, JM .
SCIENCE, 1999, 283 (5403) :822-824
[3]  
FARCHIONI R, 2001, ORGANIC ELECT MAT CO, P241
[4]   Pentacene organic thin-film transistors - Molecular ordering and mobility [J].
Gundlach, DJ ;
Lin, YY ;
Jackson, TN ;
Nelson, SF ;
Schlom, DG .
IEEE ELECTRON DEVICE LETTERS, 1997, 18 (03) :87-89
[5]  
GUNDLACH DJ, 1999, 57 ANN DEV RES C, P164
[6]   Fabrication of p-pentacene/n-Si organic photodiodes and characterization of their photoelectric properties [J].
Kim, SS ;
Choi, YS ;
Kim, K ;
Kim, JH ;
Im, S .
APPLIED PHYSICS LETTERS, 2003, 82 (04) :639-641
[7]   Optimum channel thickness in pentacene-based thin-film transistors [J].
Lee, J ;
Kim, K ;
Kim, JH ;
Im, S ;
Jung, DY .
APPLIED PHYSICS LETTERS, 2003, 82 (23) :4169-4171
[8]   Electrical characteristics of pentacene-based Schottky diodes [J].
Lee, YS ;
Park, JH ;
Choi, JS .
OPTICAL MATERIALS, 2003, 21 (1-3) :433-437
[9]   Optical and luminescence characteristics of thermally evaporated pentacene films on Si [J].
Park, SP ;
Kim, SS ;
Kim, JH ;
Whang, CN ;
Im, S .
APPLIED PHYSICS LETTERS, 2002, 80 (16) :2872-2874
[10]  
Pope M., 1999, ELECT PROCESSES ORGA, P379