Incident photon-to-current efficiency IPCE

Fig. 3.24 Incident photon to current efficiency (IPCE) spectrum of a titania nanotube array photoelectrode.

Steady-state wavelength-specific photocurrents were measured for the Ti-Fe-0 films in a two-electrode arrangement at different applied voltages. Incident photon-to-current efficiencies (IPCE) are calculated using the following equation ... 

The performance of the cell can be quantified on a macroscopic level with parameters such as incident photon to current efficiency (IPCE), open-circuit photo voltage (Voc), and the overall efficiency of the photovoltaic cell (i7ceM). 

Fig. 4. Dependence of incident photon to current efficiency (IPCE) on excitation wavelength and presence of current-doubling agent. ITO electrodes were covered with P25 (squares) or 3% [PtCl4]/P25 (circles) and biased at a constant potential of 0.7 V vs. Ag/AgCl in 0.1 M NaOH solution (a)). After addition of 0.1 M HCOONa the IPCE values increased (open circles, (b)). The inserts show the zoomed visible region.

Under steady-state conditions, that is, under constant irradiation, the incident photon-to-current efficiency (IPCE) as a function of the wavelength k can then be given in terms of these reactions as follows ... 

The spectral response, or action spectrum, of a phototodiode is obtained by measuring the electrical response of the device upon monochromatic illumination over a wide range of wavelengths. The external quantum efficiency ij, often also called the incident photon-to-current efficiency (IPCE) of the device, is the ratio of the measured photocurrent (in electrons per unit area and time) to the intensity of incoming monochromatic light in photons per unit area and time. Explicitly,... 

Incident Photon-to-Current Efficiency (IPCE)/External Quantum Efficiency (EQE)... 

The incident photon-to-current efficiency (IPCE) is a measure of the ratio of the photocurrent (converted to an electron transfer rate) versus the rate of incident photons (converted from the calibrated power of a light source) as a function of wavelength. IPCE takes into consideration the efficiencies for photon absorption/... 

Incident Photon to Current Efficiency IPCE, also called external quantum efficiency, is the ratio of electrons collected at the terminals to incident... 

Fig. 4.9 Photoelectrochemical characterization of Si-doped Fc203 electrodes prepared by the APCVD technique. The left graph shows the current-voltage characteristics in darkness and under simulated sunlight (100 mW/cm ) at a scan rate of 50 mV/s. (a) Unmodified Fe203 (b) the same electrode after cobalt treatment. The right graph shows the incident photon-to-current efficiency (IPCE) spectrum of the same electrode at different conditions, (a) Unmodified Fc203 at 1.23 Yrhe (b) after cobalt deposition, at 1.23 Vrhe> (c) at 1.43 Vrhe, (d) at 1.03 Vrhe, (e) at 1.23 Vrhe but illuminated through the Sn02 substrate (f) absorption spectrum of this electrode. From [105] used with permission...

In calculations of efficiency, Xt is to be compared with the carrier lifetime in the space charge layer, Tr. From a qualitative standpoint, if Xi > Tr, a sizable proportion of minority carriers generated inside space charge layer will recombine before making it to the semiconductor/electrolyte interface. Taking a quantitative approach, Jarrett solved the diffusion equation for an illuminated planar semiconductor/electrolyte interface and calculated incident photon-to-current efficiency (IPCE) for systems with varying xJxb. [8]. One series of calculations used as... 

The partially-oxidized PANI film shows a higti photoelectrochemical activity. Figure 4 presents the photocurrent )ectra of the partially-oxidized and reduced PANI films on Au/p-ATP in Ihe same 0.05M Fe(CN)6 7 FeCCN) solutioa The incident-photon-to-current efficiencies (IPCE) are defined by the equation ... 

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