Three-Channel Transmission Line Impedance Model for Mesoscopic Oxide Electrodes Functionalized with a Conductive Coating

Bisquert, Juan; Grätzel, Michaël; Wang, Qing; Fabregat‐Santiago, Francisco

doi:10.1021/jp0611727

Cited by 111 publications

(96 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The detailed analysis of all aspects of the impedance spectra is beyond the scope of this communication. Nevertheless, we have developed an advanced model that allows the extraction of all relevant information from the impedance spectra, taking into consideration some previous results on DSSCs 20 . All details on the IS model employed for the characterization of the measured samples can be found in Supplementary Note 1.…”

Section: Performancementioning

confidence: 99%

Mechanism of carrier accumulation in perovskite thin-absorber solar cells

et al. 2013

Self Cite

View full text Add to dashboard Cite

Photovoltaic conversion requires two successive steps: accumulation of a photogenerated charge and charge separation. Determination of how and where charge accumulation is attained and how this accumulation can be identified is mandatory for understanding the performance of a photovoltaic device and for its further optimization. Here we analyse the mechanism of carrier accumulation in lead halide perovskite, CH 3 NH 3 PbI 3 , thin-absorber solar cells by means of impedance spectroscopy. A fingerprint of the charge accumulation in high density of states of the perovskite absorber material has been observed at the capacitance of the samples. This is, as far as we know, the first observation of charge accumulation in light-absorbing material for nanostructured solar cells, indicating that it constitutes a new kind of photovoltaic device, differentiated from sensitized solar cells, which will require its own methods of study, characterization and optimization.

show abstract

Section: Performancementioning

confidence: 99%

Mechanism of carrier accumulation in perovskite thin-absorber solar cells

et al. 2013

Self Cite

View full text Add to dashboard Cite

show abstract

“…If the resistances R tr and R rec can be determined from the spectra, then the diffusion length can be obtained from the expression derived from Equation (25) [Eq. (59)]: [1] …”

Section: Interpretation Of Diffusion-recombination Impedancementioning

confidence: 99%

Diffusion–Recombination Impedance Model for Solar Cells with Disorder and Nonlinear Recombination

2013

Self Cite

View full text Add to dashboard Cite

The diffusion–recombination model is a key tool in understanding the photovoltaic operation of solar cells. Dye‐sensitized solar cells, organic solar cells, and inorganic semiconductor solar cells are systems affected by disorder that are often characterized with impedance spectroscopy. In this paper, we extend the previous theory of diffusion–recombination impedance including traps and nonlinear recombination. We show the transmission line equivalent circuit representation, and we describe the physical meaning of a number of model parameters that can be obtained: the chemical capacitance, ${C_\mu }$; the recombination resistance, ${R_{{\rm{rec}}} }$; the transport resistance, ${R_{{\rm{tr}}} }$; the electron lifetime, ${\tau _n }$; the electron conductivity, ${\sigma _n }$; the chemical diffusion coefficient of electrons, ${D_n }$; and the diffusion length, ${L_n }$. At most, three of these parameters are independent, but if the diffusion length is short, the impedance model collapses to a function that has one degree of freedom less, known as the Gerischer impedance. We show the connection of the two parameters that remain to the diffusion length and the lifetime.

show abstract

“…60 It is even possible to electronically address from the substrate the molecular layer absorbed in the surface of the mesoporous structure. 61,62 Since the changes in electrode potential modify the properties of the electrode, very often we are interested in characterizing the nanostructured electrode as a function of the steadystate Fermi level or electrochemical potential. To this end one uses a measurement based on a general principle that involves two levels of perturbation.…”

Section: Basic Features Of Nanostructured Electrochemical Devicesmentioning

confidence: 99%

“…The small perturbation produces differential quantities such as a resistance or capacitance. Studies of macroscopic assemblies of semiconductor nanoparticles often utilize such techniques, including electrochemical impedance spectroscopy (EIS), [62][63][64][65][66][67] intensity-modulated photocurrent spectroscopy (IMPS), [68][69][70][71][72] and intensity-modulated photovoltage spectroscopy (IMVS). 73 Recently, many studies have determined the properties of DSC using EIS.…”

Section: Basic Features Of Nanostructured Electrochemical Devicesmentioning

confidence: 99%