고분자 태양전지에서의 고분자 유전상수 증가에 따른 재결합 손실 감소

조남철; 김태동; 알렉스 젠; Namchul Cho; Tae-Dong Kim; Alex K.-Y. Jen

Polymer(Korea), Vol.42, No.4, 708-713, July, 2018

DOI10.7317/pk.2018.42.4.708 Export Citation

고분자 태양전지에서의 고분자 유전상수 증가에 따른 재결합 손실 감소

Reduced Recombination Losses with Enhanced Dielectric Permittivity of Donor Polymers in Polymer Solar Cells

조남철, 김태동^{1, †}, 알렉스 젠^{2, †}

순천향대학교 에너지시스템학과
¹한남대학교 신소재공학과
²워싱턴주립대학교 및 홍콩시티대학교 재료공학과

Namchul Cho¹, Tae-Dong Kim^{2, †}, and Alex K.-Y. Jen^{3, 4, †}

¹Department of Energy Systems, Soonchunhyang University, Asan 31538, Korea
²Department of Advanced Materials and Chemical Engineering, Hannam University, Daejeon 34054, Korea
³Department of Materials Science and Engineering, University of Washington, Seattle, WA 98195-2120, USA,
⁴Department of Chemistry and Department of Materials Science and Engineering, City University of Hong Kong, Kowloon, Hong Kong

E-mail:,

초록

본 연구에서는 나이트릴 그룹을 작용기로 가지는 고분자에 전기장을 가해주어 고분자의 분극도를 높여 고분자의 유전상수를 증가시키는 연구를 진행하였다. 전자주게 고분자의 유전상수를 증가시켜 재결합에 의한 손실을 효과적으로 감소시킬 수 있었고 이로 인해 고분자 태양전지의 개방전압을 증가시킬 수 있음을 보고하였다. 이러한 결과로부터 고분자 태양전지에서 고분자의 유전상수가 가지는 중요성 및 외부 전기장에 의한 고분자의 배열을 이용한 응용분야에 대한 중요성을 밝혔다.

In this work, we have demonstrated that the electric field assisted poling of the donor polymer possessing conformationally labile nitrile groups increases dipolar polarization and dielectric permittivity. We find that the enhanced dielectric permittivity of the donor polymer reduces non-geminate recombination losses in bulk-heterojunction (BHJ) solar cells (SCs), resulting in increased open circuit voltage (VOC) compared with unpoled devices. This result reveals the importance of dielectric permittivity of polymers and also signifies the promising applicability of electric field assisted poling for high dielectric polymers in BHJ SCs.

Keywords:polymer solar cell;dielectric permittivity;electric field assisted poling;charge dynamics;charge recombination

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Breselge M, Van Severen I, Lutsen L, Adriaensens P, Manca J, Vanderzande D, Cleij T, Thin Solid Films, 511, 328 (2006)
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Cowan SR, Roy A, Heeger AJ, Phys. Rev. B, 82, 245207 (2010)
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[1] Koster LJA, Shaheen SE, Hummelen JC, Adv. Energy Mater., 2, 1246 (2012)

[2] Schwarz C, Bassler H, Bauer I, Koenen JM, Preis E, Scherf U, Kohler A, Adv. Mater., 24(7), 922 (2012)

[3] Bernardo B, Cheyns D, Verreet B, Schaller R, Rand B, Giebink N, Nat. Commun., 5, 3245 (2014)

[4] Deibel C, Strobel T, Dyakonov V, Phys. Rev. Lett., 103, 36402 (2009)

[5] Credgington D, Jamieson FC, Walker B, Nguyen TQ, Durrant JR, Adv. Mater., 24(16), 2135 (2012)

[6] Cho N, Schlenker CW, Knesting KM, Koelsch P, Yip HL, Ginger DS, Jen AKY, Adv. Energy Mater., 4, 130185 (2014)

[7] Torabi S, Jahani F, Van Severen I, Kanimozhi C, Patil S, Havenith RWA, Chiechi RC, Lutsen L, Vanderzande DJM, Cleij TJ, Hummelen JC, Koster LJA, Adv. Funct. Mater., 25(1), 150 (2015)

[8] Breselge M, Van Severen I, Lutsen L, Adriaensens P, Manca J, Vanderzande D, Cleij T, Thin Solid Films, 511, 328 (2006)

[9] Cho N, Yip HL, Davies JA, Kazarinoff PD, Zeigler DF, Durban MM, Segawa Y, O’Malley KM, Luscombe CK, Jen AKY, Adv. Energy Mater., 1, 1148 (2011)

[10] Cho N, Yip HL, Hau SK, Chen KS, Kim TW, Davies JA, Zeigler DF, Jen AKY, J. Mater. Chem., 21, 6956 (2011)

[11] Cho N, Yip HL, Jen AKY, Appl. Phys. Lett., 102, 233903 (2013)

[12] Runt P, Fitzgerald JJ, American Chemical Society, Washington, DC, USA, 1997.

[13] Pope M, Swenberg CE, Electronic processes in organic crystals and polymers, Oxford University Press, Oxford, 1999.

[14] Saiz E, Hummel J, Flory P, Plavsic M, J. Phys. Chem., 85, 3211 (1981)

[15] Danielson J, Jones A, Gosselin J, Natisin M, Surko C, Phys. Rev. A,, 85, 022709 (2012)

[16] Rauh D, Deibel C, Dyakonov V, Adv. Funct. Mater., 22(16), 3371 (2012)

[17] Cowan SR, Roy A, Heeger AJ, Phys. Rev. B, 82, 245207 (2010)

[18] Cho N, Li CZ, Yip HL, Jen AKY, Energy Environ. Sci., 7, 638 (2014)

[19] Kim JH, Cho N, Mol. Cryst. Liq. Cryst., 655(1), 35 (2017)

[20] Cho N, Mol. Cryst. Liq. Cryst., 655(1), 159 (2017)

[21] Wetzelaer GJA, Kuik M, Blom PW, Adv. Energy Mater., 2, 1232 (2012)

[22] Deibel C, Wagenpfahl A, Dyakonov V, Phys. Rev. B, 80, 75203 (2009)