Abstract
In this study, the operation of donor/acceptor photovoltaic cells fabricated on homoepitaxially grown p-doped rubrene single-crystal substrates is demonstrated. The photocurrent density is dominated by the sheet conductivity (σ□) of the p-type single-crystal layer doped to 100 ppm with an iron chloride (Fe2Cl6) acceptor. A 65 μm thick p-type rubrene single-crystal substrate is expected to be required for a photocurrent density of 20 mA·cm−2. An entire bulk doping technique for rubrene single crystals is indispensable for the fabrication of practical organic single-crystal solar cells.
Highlights
IntroductionAnother recent investigation reported that a long exciton diffusion length (reaching 2–8 μm for rubrene single crystals) can produce a blend junction-free organic solar cell [5]
The creation of organic single crystals with high carrier mobilitywas demonstrated in previous studies
We demonstrate the operation of organic D/A heterojunction photovoltaic cells fabricated on p-doped rubrene single-crystal substrates
Summary
Another recent investigation reported that a long exciton diffusion length (reaching 2–8 μm for rubrene single crystals) can produce a blend junction-free organic solar cell [5]. Single-crystalline nanoribbons exhibiting an efficiency of 0.007% [8], were investigated Building on these prior studies, we developed a doping technique for homoepitaxially grown rubrene single-crystal layers [9,10]. We fabricated an organic pn-homojunction photovoltaic cell on a doped rubrene single-crystal substrate [11]. We fabricated organic donor/acceptor (D/A) heterojunction photovoltaic cells on doped rubrene single-crystal substrates. This was expected to generate a photocurrent of a larger magnitude due to the efficient exciton dissociation at the D/A heterojunction. The main purpose of this study is to determine the variables required for the production of organic single-crystal substrates
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