A perovskite based plug and play AC photovoltaic device with ionic liquid induced transient opto-electronic conversion

  • Karak S
  • Nanjo C
  • Odaka M
 et al. 
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This study reports on the implementation of transient opto-electronic conversion for energy harvesting associated with induced electric double layers (EDLs) at perovskite/ionic liquid interfaces. High speed alternating current (AC) producing photovoltaic devices are successfully fabricated and demonstrated with a device architecture as indium tin oxide (ITO)/poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS)/perovskite (CH3NH3PbI3)/ [6,6]-phenyl-C61-butyric acid methyl ester (PCBM)/ionic liquid/aluminum (Al). 52% peak external quantum efficiency with maximum responsivity of 228 mA/W has been observed with a relatively uniform response over the whole visible solar spectrum. Such new class of devices can produce photocurrent under both light 'ON' and 'OFF' cycle in response to a pulsed signal. This unique feature makes them inherently capable of producing AC power when illuminated under modulated solar radiation. Large (~90 dB) linear dynamic range (LDR) of the devices confirms their efficient power conversion capabilities even from very low intense light sources. At 50 Hz modulation frequency, photovoltaic device with ~2% over all affective AC power conversion efficiency which further increases and saturated around ~3% beyond 160 Hz modulation frequency, is successfully realized too. Mechanism of the AC effect formation is explained based on the energy band diagram and an equivalent resistance (R)-capacitance (C) circuit of the devices.

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