Charge transport studies of polymeric photovoltaic thin films with an electron blocking and trapping layer

Harrison K.H. Lee; Kevin K.H. Chan; S. K. So

doi:10.1117/12.922172

Charge transport studies of polymeric photovoltaic thin films with an electron blocking and trapping layer

Harrison K.H. Lee
, Kevin K.H. Chan
, S. K. So^*

^*Corresponding author for this work

Department of Physics

Research output: Chapter in book/report/conference proceeding › Conference proceeding › peer-review

1 Citation (Scopus)

Abstract

The transport properties of two photovoltaic polymers, poly(3- hexylthiophene) (P3HT) and poly(2,7-carbazole) derivative (PCDTBT), and their polymer:fullerene bulk heterojunction (BHJ) are studied by space-charge-limited current (SCLC), dark-injection space-charge-limited current (DI-SCLC), and admittance spectroscopy(AS). For a nominally hole-only device, electrons leakage occurs. This results in a current larger than the theoretical SCLC and ill-defined DI-SCLC and AS signals. In order to prevent electron leakage, a hole-transporting but electron blocking/trapping thin layer is added between active layer and Au. The layer composed of copper phthalocyanine (CuPc) doped into an amine-based small molecule. Using this interlayer, well-defined carrier transit time can be obtained for mobility extraction. With a suitable interlayer to suppress undesirable carrier injection and transport, these techniques should find broad applications in the transport characterization of narrow gap photovoltaic polymers and BHJ blends.

Original language	English
Title of host publication	Organic Photonics V
DOIs	https://doi.org/10.1117/12.922172
Publication status	Published - 2012
Event	Organic Photonics V - Brussels, Belgium Duration: 16 Apr 2012 → 18 Apr 2012

Publication series

Name	Proceedings of SPIE - The International Society for Optical Engineering
Volume	8435
ISSN (Print)	0277-786X

Conference

Conference	Organic Photonics V
Country/Territory	Belgium
City	Brussels
Period	16/04/12 → 18/04/12

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

SDG 7 Affordable and Clean Energy

User-Defined Keywords

Admittance spectroscopy
Carrier mobility
Dark-injection space-charge-limited current
Electron blocking
Electron trapping
Energetic disorder
P3HT
PCDTBT

Access to Document

10.1117/12.922172

Cite this

@inproceedings{520586ff7a9f4e4785b08335ac977ccf,

title = "Charge transport studies of polymeric photovoltaic thin films with an electron blocking and trapping layer",

abstract = "The transport properties of two photovoltaic polymers, poly(3- hexylthiophene) (P3HT) and poly(2,7-carbazole) derivative (PCDTBT), and their polymer:fullerene bulk heterojunction (BHJ) are studied by space-charge-limited current (SCLC), dark-injection space-charge-limited current (DI-SCLC), and admittance spectroscopy(AS). For a nominally hole-only device, electrons leakage occurs. This results in a current larger than the theoretical SCLC and ill-defined DI-SCLC and AS signals. In order to prevent electron leakage, a hole-transporting but electron blocking/trapping thin layer is added between active layer and Au. The layer composed of copper phthalocyanine (CuPc) doped into an amine-based small molecule. Using this interlayer, well-defined carrier transit time can be obtained for mobility extraction. With a suitable interlayer to suppress undesirable carrier injection and transport, these techniques should find broad applications in the transport characterization of narrow gap photovoltaic polymers and BHJ blends.",

keywords = "Admittance spectroscopy, Carrier mobility, Dark-injection space-charge-limited current, Electron blocking, Electron trapping, Energetic disorder, P3HT, PCDTBT",

author = "Lee, \{Harrison K.H.\} and Chan, \{Kevin K.H.\} and So, \{S. K.\}",

year = "2012",

doi = "10.1117/12.922172",

language = "English",

isbn = "9780819491275",

series = "Proceedings of SPIE - The International Society for Optical Engineering",

booktitle = "Organic Photonics V",

}

Charge transport studies of polymeric photovoltaic thin films with an electron blocking and trapping layer. / Lee, Harrison K.H.; Chan, Kevin K.H.; So, S. K.
Organic Photonics V. 2012. 84351U (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 8435).

Research output: Chapter in book/report/conference proceeding › Conference proceeding › peer-review

TY - GEN

T1 - Charge transport studies of polymeric photovoltaic thin films with an electron blocking and trapping layer

AU - Lee, Harrison K.H.

AU - Chan, Kevin K.H.

AU - So, S. K.

PY - 2012

Y1 - 2012

N2 - The transport properties of two photovoltaic polymers, poly(3- hexylthiophene) (P3HT) and poly(2,7-carbazole) derivative (PCDTBT), and their polymer:fullerene bulk heterojunction (BHJ) are studied by space-charge-limited current (SCLC), dark-injection space-charge-limited current (DI-SCLC), and admittance spectroscopy(AS). For a nominally hole-only device, electrons leakage occurs. This results in a current larger than the theoretical SCLC and ill-defined DI-SCLC and AS signals. In order to prevent electron leakage, a hole-transporting but electron blocking/trapping thin layer is added between active layer and Au. The layer composed of copper phthalocyanine (CuPc) doped into an amine-based small molecule. Using this interlayer, well-defined carrier transit time can be obtained for mobility extraction. With a suitable interlayer to suppress undesirable carrier injection and transport, these techniques should find broad applications in the transport characterization of narrow gap photovoltaic polymers and BHJ blends.

AB - The transport properties of two photovoltaic polymers, poly(3- hexylthiophene) (P3HT) and poly(2,7-carbazole) derivative (PCDTBT), and their polymer:fullerene bulk heterojunction (BHJ) are studied by space-charge-limited current (SCLC), dark-injection space-charge-limited current (DI-SCLC), and admittance spectroscopy(AS). For a nominally hole-only device, electrons leakage occurs. This results in a current larger than the theoretical SCLC and ill-defined DI-SCLC and AS signals. In order to prevent electron leakage, a hole-transporting but electron blocking/trapping thin layer is added between active layer and Au. The layer composed of copper phthalocyanine (CuPc) doped into an amine-based small molecule. Using this interlayer, well-defined carrier transit time can be obtained for mobility extraction. With a suitable interlayer to suppress undesirable carrier injection and transport, these techniques should find broad applications in the transport characterization of narrow gap photovoltaic polymers and BHJ blends.

KW - Admittance spectroscopy

KW - Carrier mobility

KW - Dark-injection space-charge-limited current

KW - Electron blocking

KW - Electron trapping

KW - Energetic disorder

KW - P3HT

KW - PCDTBT

UR - https://www.scopus.com/pages/publications/84862289259

U2 - 10.1117/12.922172

DO - 10.1117/12.922172

M3 - Conference proceeding

AN - SCOPUS:84862289259

SN - 9780819491275

T3 - Proceedings of SPIE - The International Society for Optical Engineering

BT - Organic Photonics V

T2 - Organic Photonics V

Y2 - 16 April 2012 through 18 April 2012

ER -

Charge transport studies of polymeric photovoltaic thin films with an electron blocking and trapping layer

Abstract

Publication series

Conference

UN SDGs

User-Defined Keywords

Access to Document

Other files and links

Fingerprint

Cite this