Open-circuit voltage dependency on hole-extraction layers in planar heterojunction organic solar cells

Chandramouli Kulshreshtha; Jin Woo Choi; Jeong Kyu Kim; Woo Sik Jeon; Min Chul Suh; Yougsup Park; Jang Hyuk Kwon

doi:10.1063/1.3610962

Open-circuit voltage dependency on hole-extraction layers in planar heterojunction organic solar cells

Chandramouli Kulshreshtha, Jin Woo Choi, Jeong Kyu Kim, Woo Sik Jeon, Min Chul Suh, Yougsup Park, Jang Hyuk Kwon

Research output: Contribution to journal › Article › peer-review

46 Citations (Scopus)

Abstract

The open-circuit voltage (V_oc) dependency on hole-extraction layers (HELs) with different energy levels and mobility was investigated in a single stack heterojunction subphthalocyanine chloride (SubPc)/C₆₀ organic solar cells. The HELs having about 0.2-0.3 eV higher highest occupied molecular orbital (HOMO) level than that of a donor material can significantly enhance the V_oc in SubPc/C₆₀ device due to a corresponding built-in potential increase. The high mobility of HELs can also increase V _oc with increasing J_sc according to the simple diode equation. Among all HELs we utilized, N,N,N′,N′-tetra(biphenyl-4-yl) biphenyl-4,4′-diamine (TBBD) illustrates a largest increase in V _oc (from 0.90 to 1.15 V) with an improvement in efficiency compared to a reference SubPc/C₆₀ device without HEL. This increase is mainly attributed to easy and rapid extraction of holes by TBBD due to its proper HOMO level and high mobility.

Original language	English
Article number	023308
Journal	Applied Physics Letters
Volume	99
Issue number	2
DOIs	https://doi.org/10.1063/1.3610962
Publication status	Published - 11 Jul 2011

Bibliographical note

Funding Information:
This work was supported by the National Research Foundation of Korea Grant funded by the Korean Government (MEST) (Grant No. NRF-2009-0093323).

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title = "Open-circuit voltage dependency on hole-extraction layers in planar heterojunction organic solar cells",

abstract = "The open-circuit voltage (Voc) dependency on hole-extraction layers (HELs) with different energy levels and mobility was investigated in a single stack heterojunction subphthalocyanine chloride (SubPc)/C60 organic solar cells. The HELs having about 0.2-0.3 eV higher highest occupied molecular orbital (HOMO) level than that of a donor material can significantly enhance the Voc in SubPc/C60 device due to a corresponding built-in potential increase. The high mobility of HELs can also increase V oc with increasing Jsc according to the simple diode equation. Among all HELs we utilized, N,N,N′,N′-tetra(biphenyl-4-yl) biphenyl-4,4′-diamine (TBBD) illustrates a largest increase in V oc (from 0.90 to 1.15 V) with an improvement in efficiency compared to a reference SubPc/C60 device without HEL. This increase is mainly attributed to easy and rapid extraction of holes by TBBD due to its proper HOMO level and high mobility.",

author = "Chandramouli Kulshreshtha and Choi, {Jin Woo} and Kim, {Jeong Kyu} and Jeon, {Woo Sik} and Suh, {Min Chul} and Yougsup Park and Kwon, {Jang Hyuk}",

note = "Funding Information: This work was supported by the National Research Foundation of Korea Grant funded by the Korean Government (MEST) (Grant No. NRF-2009-0093323). ",

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doi = "10.1063/1.3610962",

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AU - Kulshreshtha, Chandramouli

AU - Choi, Jin Woo

AU - Kim, Jeong Kyu

AU - Jeon, Woo Sik

AU - Suh, Min Chul

AU - Park, Yougsup

AU - Kwon, Jang Hyuk

N1 - Funding Information: This work was supported by the National Research Foundation of Korea Grant funded by the Korean Government (MEST) (Grant No. NRF-2009-0093323).

PY - 2011/7/11

Y1 - 2011/7/11

N2 - The open-circuit voltage (Voc) dependency on hole-extraction layers (HELs) with different energy levels and mobility was investigated in a single stack heterojunction subphthalocyanine chloride (SubPc)/C60 organic solar cells. The HELs having about 0.2-0.3 eV higher highest occupied molecular orbital (HOMO) level than that of a donor material can significantly enhance the Voc in SubPc/C60 device due to a corresponding built-in potential increase. The high mobility of HELs can also increase V oc with increasing Jsc according to the simple diode equation. Among all HELs we utilized, N,N,N′,N′-tetra(biphenyl-4-yl) biphenyl-4,4′-diamine (TBBD) illustrates a largest increase in V oc (from 0.90 to 1.15 V) with an improvement in efficiency compared to a reference SubPc/C60 device without HEL. This increase is mainly attributed to easy and rapid extraction of holes by TBBD due to its proper HOMO level and high mobility.

AB - The open-circuit voltage (Voc) dependency on hole-extraction layers (HELs) with different energy levels and mobility was investigated in a single stack heterojunction subphthalocyanine chloride (SubPc)/C60 organic solar cells. The HELs having about 0.2-0.3 eV higher highest occupied molecular orbital (HOMO) level than that of a donor material can significantly enhance the Voc in SubPc/C60 device due to a corresponding built-in potential increase. The high mobility of HELs can also increase V oc with increasing Jsc according to the simple diode equation. Among all HELs we utilized, N,N,N′,N′-tetra(biphenyl-4-yl) biphenyl-4,4′-diamine (TBBD) illustrates a largest increase in V oc (from 0.90 to 1.15 V) with an improvement in efficiency compared to a reference SubPc/C60 device without HEL. This increase is mainly attributed to easy and rapid extraction of holes by TBBD due to its proper HOMO level and high mobility.

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Open-circuit voltage dependency on hole-extraction layers in planar heterojunction organic solar cells

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