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Devices with the structure of ITO/Pentacene/C60/Al were prepared. Then, in order to enhance the performance of these cells and study the mechanism of the cathodic buffer layer, bathocuproine (BCP) of different thickness were inserted between C60 and Al. When inserting 10 nm BCP, the power conversion effciency of the cell is as high as 0.46%. On this basis, bathophenanthroline (Bphen) and 3, 4, 9, 10-Perylenetetracarb-oxylicdianhydride (PTCDA) are used instead of BCP, so as to compare and discuss the effects on the performance of the solar cells caused by the electron mobility and optical absorption properties of the cathodic buffer layers. As the electron mobility of Bphen is two orders of magnitude higher than that of BCP, the efficiency of devices with Bphen as the buffer layer was improved to 0.56%. Furthermore, the absorption spectrum of devices was obviously enhanced by inserting PTCDA material which has large absorption in visible light region, and the highest current density of such device was enhanced to 5.97 mA/cm2 and the efficiency was 0.87%.
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Keywords:
- organic solar cells /
- Pentacene /
- C60 /
- buffer layer
[1] Terao Y, Sasabe H, Adachi C 2007 Appl. Phys. Lett. 90 103515
[2] Yoo S, Domercq B, Kippelen B 2004 Appl. Phys. Lett. 85 5427
[3] Pandey A K, Nunzi J M 2006 Appl. Phys. Lett. 89 213506
[4] Tao C L, Zhang X H, Dong M J, Liu Y Y, Sun S, Ou G P, Zhang F J, Zhang H L 2008 Chin. Phys. B 17 281
[5] Yang J, Nguyen T Q 2007 Organic Electronics 8 566
[6] Potscavage W J, Yoo S, Domercq B, Kippelen B 2007 Appl. Phys. Lett. 90 253511
[7] Sullivan P, Jones T S 2008 Organic Electronics 9 656
[8] Cantrell R, Clancy P 2008 Surface Science 602 3499
[9] Peumans P, Forrest S R 2001 Appl. Phys. Lett. 79 126
[10] Peumans P, Yakimov Y, Forrest S R 2003 Appl. Phys. Lett. 93 3693
[11] Chan M Y, Lee C S, Lai S L, Fung M K, Wong F L, Sun H Y, Lau K M, Lee S T 2006 J. Appl. Phys. 100 094506
[12] Song Q L, Li C M, Wang M L, Sun X Y, Hou X Y 2007 Appl. Phys. Lett. 90 071109
[13] Tatsuo Mori, Kohei Kato 2007 Journal of Photopolymer Science and Technology 20 61
[14] Wang N N, Yu J S, Lin H, Jiang Y D 2010 Chin. J.Chem. Phys. 23 84
[15] Li Y W, Liu P Y, Hou L T, Wu B 2010 Acta Phys. Sin. 59 1248 (in Chinese) [李艳武、刘彭义、侯林涛、吴 冰 2010 物 理学报 59 1248] [16] Naka S, Okada H, Onnagawa H, Tsutsui T 2000 Appl. Phys. Lett. 76 197
[16] Li R H, Meng W M, Peng Y Q, Ma C Z, Wang R S, Xie H W, Wang Y, Ye Z C 2010 Acta Phys. Sin. 59 2126 (in Chinese) [李荣华、孟卫民、彭应全、马朝柱、汪润生、谢宏伟、王 颖、叶早晨 2010 59 2126]
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[1] Terao Y, Sasabe H, Adachi C 2007 Appl. Phys. Lett. 90 103515
[2] Yoo S, Domercq B, Kippelen B 2004 Appl. Phys. Lett. 85 5427
[3] Pandey A K, Nunzi J M 2006 Appl. Phys. Lett. 89 213506
[4] Tao C L, Zhang X H, Dong M J, Liu Y Y, Sun S, Ou G P, Zhang F J, Zhang H L 2008 Chin. Phys. B 17 281
[5] Yang J, Nguyen T Q 2007 Organic Electronics 8 566
[6] Potscavage W J, Yoo S, Domercq B, Kippelen B 2007 Appl. Phys. Lett. 90 253511
[7] Sullivan P, Jones T S 2008 Organic Electronics 9 656
[8] Cantrell R, Clancy P 2008 Surface Science 602 3499
[9] Peumans P, Forrest S R 2001 Appl. Phys. Lett. 79 126
[10] Peumans P, Yakimov Y, Forrest S R 2003 Appl. Phys. Lett. 93 3693
[11] Chan M Y, Lee C S, Lai S L, Fung M K, Wong F L, Sun H Y, Lau K M, Lee S T 2006 J. Appl. Phys. 100 094506
[12] Song Q L, Li C M, Wang M L, Sun X Y, Hou X Y 2007 Appl. Phys. Lett. 90 071109
[13] Tatsuo Mori, Kohei Kato 2007 Journal of Photopolymer Science and Technology 20 61
[14] Wang N N, Yu J S, Lin H, Jiang Y D 2010 Chin. J.Chem. Phys. 23 84
[15] Li Y W, Liu P Y, Hou L T, Wu B 2010 Acta Phys. Sin. 59 1248 (in Chinese) [李艳武、刘彭义、侯林涛、吴 冰 2010 物 理学报 59 1248] [16] Naka S, Okada H, Onnagawa H, Tsutsui T 2000 Appl. Phys. Lett. 76 197
[16] Li R H, Meng W M, Peng Y Q, Ma C Z, Wang R S, Xie H W, Wang Y, Ye Z C 2010 Acta Phys. Sin. 59 2126 (in Chinese) [李荣华、孟卫民、彭应全、马朝柱、汪润生、谢宏伟、王 颖、叶早晨 2010 59 2126]
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