n‐type molybdenum‐diselenide‐based liquid‐junction solar cells: A nonaqueous electrolyte system employing the chlorine/chloride couple

摘要: Single‐crystal, n‐type MoSe2 (Eg=1.4 eV) is shown to serve as a stable photoanode in an electrochemical cell employing nonaqueous (CH3CN) solution of Cl2/Cl− the redox active material. At 90 mW/cm2 input, 632.8‐nm light can be converted electricity with efficiency 5.9–7.5%. The reaction 2Cl−→Cl2 and cathode Cl2→2Cl−. qualitatively better than MoS2 (∼0.5% efficiency) which has larger band gap (1.7 eV), but both materials are rugged solution, while photocorrode aqueous Cl− solutions. In H2O, I3−/I− couple excellent CH3CN it yields lower couple. system provides evidence that transparent, reversible, non‐O2‐sensitive useful semiconductor‐based liquid‐junction cells direct material having optimum solar response.