Revealing the charge transport mechanism of a photoelectrochemical cell: analysis using A.C. voltage perturbation

• DOI: 10.1039/c4cp01734j
• Publication Date: 2014-07-28T08:34:25Z
• Authors: Dipal B. Patel; Khushbu R. Chauhan; Indrajit Mukhopad...
• Keywords: 02 engineering and technology; 0210 nano-technology

In this paper, we have carefully investigated the operation of a photoelectrochemical (PEC) cell configured PbOx|Fe(CN)6(-4/-3)|Pt in accumulation, flat band, depletion, inversion and deep-depletion regions using impedance measurements. The increases photocurrent for different differ their nature: logarithmic increase depletion region, linear region along with dark current an exponential photo- region. All these variations are studied detail to correlate observations charge transfer mechanisms. characteristics spectrum itself can be assigned mentioned regions. We found that maximum PEC cell, present investigation, extracted when is working while rate junction behaves as ideal Schottky diode single RC element. Systematic experiments suggested establish correlation between obtained from photocurrent, impedance, conductance, low frequency high capacitance It was light induced trap states semiconductor limit which has dependency on irradiance. A detailed investigation A.C. conductivity measurements showed actively participate mechanism via hopping phenomenon small activation energies 0.2 0.8 meV. increased exponentially applied bias under illumination conditions. also show new way finding potential at will wherein dominating mechanism. This study help pin pointing key affecting parameters process cell.