An organic diode operated in photovoltaic mode is used as a sensor for nitroaromatic electron accepting compounds. While illuminated by a light source with a wavelength within the organic materials absorption the device produces a small photovoltaic response due to inefficient separation of charges. Upon exposure to an electron accepting compound, the device produces an increase in photovoltaic activity due to more efficient charge separation, producing a larger measurable open circuit voltage. Upon removal of the compound the measured voltage decreases and returns to near its baseline value.
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