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Space charge region effects in bidirectional illuminated P3HT:PCBM bulk heterojunction photodetectors
Affiliation:1. Siemens AG, Corporate Technology, CT RTC MAT IEC-DE, Günther-Scharowsky-Strasse 1, 91058 Erlangen, Germany;2. Light Technology Institute (LTI), Karlsruhe Institute of Technology (KIT), Engesserstrasse 13, Building 30.34, 76131 Karlsruhe, Germany;3. Morphwize S.N.C., via Asti 9, 09126 Cagliari, Italy;1. Division of Advanced Materials, Korea Research Institute of Chemical Technology (KRICT), 141 Gajeong-ro, Yuseong-gu, Daejeon, 34114, Republic of Korea;2. Department of Chemical Convergence Materials, University of Science and Technology (UST), 217 Gajeong-ro, Yuseong-gu, Daejeon, 34113, Republic of Korea;3. Department of Chemistry, College of Science, Korea University, Seoul, 02841, Republic of Korea;4. Department of Chemistry, Kookmin University, 77 Jeongneung-ro, Seongbuk-gu, Seoul, 136-702, Republic of Korea;1. Department of Electrical and Computer Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran;2. Physics Department, University of Isfahan, Isfahan, Iran;1. Low Dimensional Materials Research Centre, Department of Physics, Faculty of Science, University of Malaya, Kuala Lumpur 50603, Malaysia;2. Centre for Ionics University of Malaya, Department of Physics, Faculty of Science, University of Malaya, Kuala Lumpur 50603, Malaysia;3. Synchrotron Light Research Institute, 111 University Avenue, Muang District, Nakhon Ratchasima 30000, Thailand;4. Department of Chemistry, Faculty of Applied Science, Umm Al-Qura University, Makkah, Saudi Arabia;5. Mechanical Engineering Department, College of Engineering and Islamic Architecture, Umm Al-Qura University, Makkah, Saudi Arabia;6. Department of Physics, Faculty of Science, King Abdulaziz University, Jeddah, Saudi Arabia
Abstract:Organic semiconductors are widely investigated for their application in photovoltaics and photodetectors. We show that the efficiency of these devices is strongly influenced by the position of the space charge region, due to unintentional doping, and wavelength-dependent absorption properties in bulk heterojunctions. Spray-coated P3HT:PCBM bulk heterojunction photodiodes with thicknesses up to 4.2 μm and semitransparent top contact enable the characterization of exciton generation and separation in both irradiation directions. A large difference in external quantum efficiency (EQE) is observed for top and bottom illuminated configurations and is explained by a bias dependent arrangement of the space charge region at the two contact electrodes. Numerical drift–diffusion simulations allow to get insight into first order mechanisms behind the spectral features of EQE data in highly-doped organic photodiodes.
Keywords:Organic semiconductor  Oxygen doping  Spray-coating  Band bending  Pinning  Space charge region
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