Effects of Carrier Mobility on Photocurrent Generation in TiO2/Poly(alkylthiophene) Photovoltaic Devices

Mi Yeon Song; Kang-Jin Kim; Dong Young Kim

Macromolecular Research, Vol.14, No.6, 630-633, December, 2006

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Effects of Carrier Mobility on Photocurrent Generation in TiO2/Poly(alkylthiophene) Photovoltaic Devices

Mi Yeon Song, Kang-Jin Kim, and Dong Young Kim^{1, †}

Department of Chemistry and Molecular Engineering, Korea University, Seoul 136-701, Korea
¹Optoelectronic Materials Research Center, Korea Institute of Science and Technology, Seoul 136-791, Korea

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In heterojunction photovoltaic devices of ITO/TiO2/poly(3-alkylthiophene)/Au, the photocurrent was characterized at different temperatures for different alkyl chain lengths and regioregularities: regiorandom, regioregular poly(3-hexylthiophene), and regioregular poly(3-dodecylthiophene). The regioregularity and alkyl chain length affected the photovoltaic characteristics due to differences in hole-carrier transportation. The drift charge mobilities of these devices were analyzed by the space-charge-limited current theory using the relation between the dark current and the bias voltage. The photocurrent in the devices based on poly(3-alkylthiophene)s decreased rapidly below the temperature at which the drift charge mobility was 10^-5 cm2/V·s.

Keywords:poly(3-alkylthiophene);charge mobility;photovoltaics;heterojunction

[References]

Huynh WU, Dittmer JJ, Alivisatos AP, Science, 295, 2425 (2002)
Burroughes JH, Bradley DDC, Brown AR, Marks RN, MacKay K, Friend RH, Burn PL, Holmes AB, Nature (London), 347, 539 (1990)
Schon JH, Kloc C, Batlogg B, Nature (London), 406, 702 (2000)
Kim HC, Kim JS, Baek SS, Ree MH, Macromol. Res., 14(2), 173 (2006)
Kaneto K, Hatae K, Nagamatsu S, Takashima W, Pandey SS, Endo K, Rikukawa M, Jpn. J. Appl. Phys., 38, L1188 (1999)
Chirvase D, Chiguvare Z, Knipper M, Parisi J, Dyakonov V, Hummelen JC, J. Appl. Phys., 93, 3376 (2003)
Melzer C, Koop EJ, Mihailetchi VD, Blom PW, Adv. Funct. Mater., 14, 865 (2004)
Riedel I, Parisi J, Dyakonov V, Dyakonov V, Lutsen L, Vanderzande D, Hummelen JC, Adv. Funct. Mater., 14, 38 (2004)
Takahashi M, Tsukigi K, Uchino T, Yoko T, Thin Solid Films, 388(1-2), 231 (2001)
Coakley KM, McGehee MD, Appl. Phys. Lett., 83, 3380 (2003)
Leclerc M, Diaz FM, Wegner G, Macromol. Chem., 190, 3105 (1989)
Fahrenbruch AL, Bube RH, in Fundamentals of Solar Cells, Academic Press, New York, 1983, Chapter 6 (1983)
Campbel AJ, Bradley DDC, Lidzey DG, J. Appl. Phys., 82, 6326 (1997)
Kaneto K, Lim, WY, Takashima W, Endo T, Rikukawa M, Jpn. J. Appl. Phys., 39, L872 (2000)

[Referenced By]

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[1] Huynh WU, Dittmer JJ, Alivisatos AP, Science, 295, 2425 (2002)

[2] Burroughes JH, Bradley DDC, Brown AR, Marks RN, MacKay K, Friend RH, Burn PL, Holmes AB, Nature (London), 347, 539 (1990)

[3] Schon JH, Kloc C, Batlogg B, Nature (London), 406, 702 (2000)

[4] Kim HC, Kim JS, Baek SS, Ree MH, Macromol. Res., 14(2), 173 (2006)

[5] Kaneto K, Hatae K, Nagamatsu S, Takashima W, Pandey SS, Endo K, Rikukawa M, Jpn. J. Appl. Phys., 38, L1188 (1999)

[6] Chirvase D, Chiguvare Z, Knipper M, Parisi J, Dyakonov V, Hummelen JC, J. Appl. Phys., 93, 3376 (2003)

[7] Melzer C, Koop EJ, Mihailetchi VD, Blom PW, Adv. Funct. Mater., 14, 865 (2004)

[8] Riedel I, Parisi J, Dyakonov V, Dyakonov V, Lutsen L, Vanderzande D, Hummelen JC, Adv. Funct. Mater., 14, 38 (2004)

[9] Takahashi M, Tsukigi K, Uchino T, Yoko T, Thin Solid Films, 388(1-2), 231 (2001)

[10] Coakley KM, McGehee MD, Appl. Phys. Lett., 83, 3380 (2003)

[11] Leclerc M, Diaz FM, Wegner G, Macromol. Chem., 190, 3105 (1989)

[12] Fahrenbruch AL, Bube RH, in Fundamentals of Solar Cells, Academic Press, New York, 1983, Chapter 6 (1983)

[13] Campbel AJ, Bradley DDC, Lidzey DG, J. Appl. Phys., 82, 6326 (1997)

[14] Kaneto K, Lim, WY, Takashima W, Endo T, Rikukawa M, Jpn. J. Appl. Phys., 39, L872 (2000)