Assertion: solar panel's cell | /r/HasProperty | based on magnesium phthalocyanine
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Source sentences:
text: In 1958 the photovoltaic effect or the creation of voltage of a cell based on magnesium phthalocyanine (MgPc)—a macrocyclic compound having an alternating nitrogen atom-carbon atom ring structure—was discovered to have a photovoltage of 200 mV.