Theory of Impedance and Capacitance Spectroscopy of Solar Cells with Dielectric Relaxation, Drift-Diffusion Transport, and Recombination

Bisquert, Juan; Bertoluzzi, Luca; Mora‐Seró, Iván; García-Belmonte, Germà

doi:10.1021/jp5062144

Cited by 192 publications

(172 citation statements)

References 37 publications

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“…[6,[16][17][18][19] The capacitance originating from the Maxwell displacement currents is frequency independent up to ~1 GHz which is far beyond the spectral range used in our study. [17,20] However, all other mechanisms strongly depend on frequency since their physical processes cannot follow a high frequency AC signal.…”

Section: Capacitance Characteristicsmentioning

confidence: 85%

Defect Dynamics in Proton Irradiated CH₃NH₃PbI₃ Perovskite Solar Cells

Брус

Lang

Bundesmann

et al. 2017

Adv Elect Materials

105

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Section: Capacitance Characteristicsmentioning

confidence: 85%

Defect Dynamics in Proton Irradiated CH₃NH₃PbI₃ Perovskite Solar Cells

Брус

Lang

Bundesmann

et al. 2017

Adv Elect Materials

105

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“…[92] Bisquert and co-workers developed a general model to analyze various IS spectral features and established the relationship between frequency region and recombination resistance under different conditions. [93] Typically, three arc features are observed in a perovskite solar cell at low, intermediate, and high frequencies. The high-frequency component (i.e., ≈10 5 Hz) is attributed to the selective contact, while the intermediate (i.e., ≈10 3 Hz) and low frequencies (i.e., ≈1 Hz) are attributed to chemical capacitance and intrinsic properties of perovskites, respectively.…”

Section: Charge Dynamicsmentioning

confidence: 99%

Interface Engineering for Highly Efficient and Stable Planar p‐i‐n Perovskite Solar Cells

Yang

Meng

Yang

2017

Advanced Energy Materials

369

265

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Organic‐inorganic halide perovskite materials have become a shining star in the photovoltaic field due to their unique properties, such as high absorption coefficient, optimal bandgap, and high defect tolerance, which also lead to the breathtaking increase in power conversion efficiency from 3.8% to over 22% in just seven years. Although the highest efficiency was obtained from the TiO2 mesoporous structure, there are increasing studies focusing on the planar structure device due to its processibility for large‐scale production. In particular, the planar p‐i‐n structure has attracted increasing attention on account of its tremendous advantages in, among other things, eliminating hysteresis alongside a competitive certified efficiency of over 20%. Crucial for the device performance enhancement has been the interface engineering for the past few years, especially for such planar p‐i‐n devices. The interface engineering aims to optimize device properties, such as charge transfer, defect passivation, band alignment, etc. Herein, recent progress on the interface engineering of planar p‐i‐n structure devices is reviewed. This review is mainly focused on the interface design between each layer in p‐i‐n structure devices, as well as grain boundaries, which are the interfaces between polycrystalline perovskite domains. Promising research directions are also suggested for further improvements.

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“…Impedance spectroscopy has previously been widely applied to study recombination, transport, and carrier extraction barriers in organic solar cells. [ 24,30,31,[38][39][40] Measurements were performed under illumination on the pristine device (fresh), and on the degraded device after the s-shape had been eliminated from the J -V (aged). (black) and after (blue) aging.…”

Section: Introductionmentioning

confidence: 99%

Loss Mechanisms in High Efficiency Polymer Solar Cells

MacKenzie

Balderrama

Schmeisser

et al. 2015

Advanced Energy Materials

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[ 6 ] and phenyl-C71-butyric acid methyl ester (PC 70 BM). [ 2 , 7 ] Despite promising results, the performance of PTB7:PC 70 BM solar cells is limited by the thin active layer, [ 3 ] carrier selectivity at the contacts, [ 8 ] and rapid degradation of the active layer and contacts caused by exposure to ambient oxygen [9][10][11] and water vapor. [ 12 ] Although inverted solar cell architectures have demonstrated high effi ciencies combined with relatively good stability, age-induced performance loss in high performance PTB7 solar cell architectures [ 2 ] has been reported, and the mechanisms are currently not well understood.Identifying the origins of performance loss in solar cells is challenging because it involves differentiating between interfacial phenomena and bulk properties. [ 13 ] Frequency resolved optoelectronic techniques such as impedance spectroscopy [ 14 ] and intensity modulated photocurrent spectroscopy (IMPS) [ 15 ] are useful in discriminating between electronic processes in the active layer and at contact interfaces, and correlating these with device performance. In this work, we combine these techniques with device modeling to identify key loss processes and aging mechanisms in state-of-the-art PTB7-based inverted solar cells incorporating a V 2 O 5 hole transport layer. After prolonged exposure to ambient conditions no change in the open circuit voltage ( V oc ) or short circuit current density ( J sc ) was observed. An s-shape is initially observed in the current density -voltage ( J -V) characteristic, which can be reversed by cycling through the J -V curve under illumination. Subsequently, a small drop in the fi ll factor (FF) from the original value of 0.7 to 0.61 was observed. With impedance spectroscopy, we demonstrate that changes to the device interfaces are completely reversible, and that performance losses related to the FF are due to degradation of the organic active layer. The IMPS analysis reveals age-related trap formation in the active layer. Interestingly, the high density of traps does not appear to have a signifi cant effect on performance. We attribute this phenomenon to slow carrier thermalization times. ResultsThe device structure is depicted in Figure 1 a. The PTB7:PC 70 BM active layer was sandwiched between an Indium tin oxide (ITO)/ poly [(9,9-bis(3-( N , N -dimethylamino)propyl)-2,7-fluorene)-alt-2,7-(9,9-dioctylfl uorene)] (PFN) [ 16 ] electron extracting contact

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Theory of Impedance and Capacitance Spectroscopy of Solar Cells with Dielectric Relaxation, Drift-Diffusion Transport, and Recombination

Cited by 192 publications

References 37 publications

Defect Dynamics in Proton Irradiated CH₃NH₃PbI₃ Perovskite Solar Cells

Defect Dynamics in Proton Irradiated CH₃NH₃PbI₃ Perovskite Solar Cells

Interface Engineering for Highly Efficient and Stable Planar p‐i‐n Perovskite Solar Cells

Loss Mechanisms in High Efficiency Polymer Solar Cells

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Theory of Impedance and Capacitance Spectroscopy of Solar Cells with Dielectric Relaxation, Drift-Diffusion Transport, and Recombination

Cited by 192 publications

References 37 publications

Defect Dynamics in Proton Irradiated CH3NH3PbI3 Perovskite Solar Cells

Defect Dynamics in Proton Irradiated CH3NH3PbI3 Perovskite Solar Cells

Interface Engineering for Highly Efficient and Stable Planar p‐i‐n Perovskite Solar Cells

Loss Mechanisms in High Efficiency Polymer Solar Cells

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Defect Dynamics in Proton Irradiated CH₃NH₃PbI₃ Perovskite Solar Cells

Defect Dynamics in Proton Irradiated CH₃NH₃PbI₃ Perovskite Solar Cells