Charge transport studies in donor-acceptor block copolymer PDPP-TNT and PC71BM based inverted organic photovoltaic devices processed in room conditions

Journal Article · Wed Jul 15 00:00:00 EDT 2015 · AIP Advances

DOI:https://doi.org/10.1063/1.4927763· OSTI ID:22492275

Srivastava, Shashi B.; Sonar, Prashant ^[1]

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1. School of Chemistry, Physics and Mechanical Engineering, Queensland University of Technology, Brisbane, Australia-4001 (Australia)

Diketopyrrolopyrole-naphthalene polymer (PDPP-TNT), a donor-acceptor co-polymer, has shown versatile behavior demonstrating high performances in organic field-effect transistors (OFETs) and organic photovoltaic (OPV) devices. In this paper we report investigation of charge carrier dynamics in PDPP-TNT, and [6,6]-phenyl C{sub 71} butyric acid methyl ester (PC71BM) bulk-heterojunction based inverted OPV devices using current density-voltage (J-V) characteristics, space charge limited current (SCLC) measurements, capacitance-voltage (C-V) characteristics, and impedance spectroscopy (IS). OPV devices in inverted architecture, ITO/ZnO/PDPP-TNT:PC71BM/MoO{sub 3}/Ag, are processed and characterized at room conditions. The power conversion efficiency (PCE) of these devices are measured ∼3.8%, with reasonably good fill-factor 54.6%. The analysis of impedance spectra exhibits electron’s mobility ∼2 × 10{sup −3} cm{sup 2}V{sup −1}s{sup −1}, and lifetime in the range of 0.03-0.23 ms. SCLC measurements give hole mobility of 1.12 × 10{sup −5} cm{sup 2}V{sup −1}s{sup −1}, and electron mobility of 8.7 × 10{sup −4} cm{sup 2}V{sup −1}s{sup −1}.

• OSTI ID: 22492275
• Journal Information: AIP Advances, Vol. 5, Issue 7; Other Information: (c) 2015 Author(s); Country of input: International Atomic Energy Agency (IAEA); ISSN 2158-3226
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
36 MATERIALS SCIENCE
BUTYRIC ACID
CHARGE CARRIERS
CHARGE TRANSPORT
COPOLYMERS
CURRENT DENSITY
ELECTRIC CONDUCTIVITY
ELECTRON MOBILITY
ELECTRONS
ESTERS
FIELD EFFECT TRANSISTORS
FILL FACTORS
HETEROJUNCTIONS
HOLE MOBILITY
IMPEDANCE
MOLYBDENUM OXIDES
NAPHTHALENE
PHOTOVOLTAIC EFFECT
SPACE CHARGE
TNT
ZINC OXIDES