The physics of photon induced degradation of perovskite solar cells

Joshi, Pranav; Zhang, Liang; Hossain, Istiaque; Abbas, Hisham A.; Kottokkaran, Ranjith; Nehra, S.P.; Dhaka, M.S.; Noack, Max; Dalal, Vikram L.

doi:10.1063/1.4967817

Cited by 59 publications

(42 citation statements)

References 31 publications

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“…The instability of the perovskite originates from its soft nature that is based on the low interaction energy between cation and iodide ion. In addition to the decomposition of CH 3 NH 3 PbI 3 with light illumination, the photoexcited carriers could reduce the energy barrier of ion migration and thus accelerate the migration process to generate more deep‐level trap defects in the devices . Figure S8, Supporting Information, shows XPS I 3d core‐level spectra at the surface of the silver electrode in the perovskite solar cell before and after 48 h light illumination.…”

Section: Resultsmentioning

confidence: 99%

Exploring Red, Green, and Blue Light‐Activated Degradation of Perovskite Films and Solar Cells for Near Space Applications

et al. 2019

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Hybrid perovskite solar cells with a high specific power have great potential to become promising power sources mounted on spacecrafts in space applications. However, there is a lack of study on their photostability as light absorbers in those conditions. Herein, the stability of the perovskite films and solar cells under red, green, and blue (RGB) light illumination in medium vacuum that belongs to near space is explored. The perovskite active layers exhibit different degradations from morphological, chemical, and structural points of view. This is attributed to the strong coupling between photoexcited carriers and the crystal lattice and the diversity of RGB light absorption in the perovskite films. Device characterizations reveal that the efficiency loss of perovskite solar cells results from not only perovskite degradation, but also the photoexcited carriers reducing the energy barrier of ion migration and accelerating the migration to generate more deep‐level trap defects. Moreover, comparative devices suggest that the well encapsulation can weaken the effect of vacuum on stability.

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Section: Resultsmentioning

confidence: 99%

Exploring Red, Green, and Blue Light‐Activated Degradation of Perovskite Films and Solar Cells for Near Space Applications

et al. 2019

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“…This hypothesis has been successfully used to explain the origin of J-V hysteresis in HOIPs. 35,[44][45][46] We found that at (Table S1). From this, we can estimate that the Vp in our pi-n device is ~0.5 V. This value is similar to Vp that was calculated by Cameron, Peter, and coworkers for an n-i-p device using transient photovoltage measurements.…”

Section: Resultsmentioning

confidence: 99%

Interplay between Ion Transport, Applied Bias, and Degradation under Illumination in Hybrid Perovskite p-i-n Devices

et al. 2018

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We studied ion transport in hybrid organic inorganic perovskite p-in devices as a function of applied bias under device operating conditions. Using electrochemical impedance spectroscopy (EIS) and equivalent circuit modeling, we elucidated various resistive and capacitive elements in the device. We show that ion migration is predictably influenced by a low applied forward bias, characterized by an increased capacitance at the hole transporting (HTM) and electron transporting material (ETM) interfaces, as well as through the bulk. However, unlike observations in n-i-p devices, we found that there is a capacitive discharge leading to possible ion redistribution in the bulk at high forward biases. Furthermore, we show that a chemical double layer capacitance buildup as a result of ion accumulation impacts the electronic properties of the device, likely by either inducing charge pinning or charge screening, depending on the direction of the ion induced field. Lastly, we extrapolate ion diffusion coefficients (~10-7 cm 2 s-1) and ionic conductivities (~10-7 S cm-1) from the Warburg mass (ion) diffusion response, and show that, as the device degrades, there is an overall depletion of capacitive effects coupled with an increased ion mobility. devices at different biases, X-ray diffraction of MAPbI3 under heat and illumination, X-ray diffraction of two-step method, evidence of Warburg diffusion, EIS fit values for one-step and two-step preparation methods, ionic conductivity (σion) values for one-step method, diffusion coefficients for both one and two-step method, comparison of geometric and double layer capacitance for two-step method, comparison of one-step and two-step methods, J-V characteristics of one-step and two-step method, double layer capacitance for devices with different HTMs, equivalent fit trends for the one-step method (PDF).

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“…10 The stability under illumination at different temperatures was studied by Holzhey et al 11 Joshi et al studied the light-induced degradation under inert atmosphere. 12 Christians et al recently demonstrated that replacing TiO 2 with SnO 2 as an electron transport layer enables a stable operation for at least 1000 h under full spectrum irradiation. 13 Several studies demonstrated that the combination of light and oxygen is particularly harmful to the performance of PSCs.…”

Section: Introductionmentioning

confidence: 99%

External quantum efficiency measurements used to study the stability of differently deposited perovskite solar cells

Hierrezuelo-Cardet

Palechor-Ocampo

Caram

et al. 2020

Journal of Applied Physics

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The instability exhibited by perovskite solar cells when exposed to the environment under illumination is one of the major obstacles for the entry of perovskite technology in the photovoltaic market. In this work, we use the external quantum efficiency (EQE) technique to study the photoinduced degradation of two types of solar cells having CH 3 NH 3 PbI 3 as an absorber layer: one deposited by spin coating with an n-i-p architecture and the other deposited by evaporation with an inverted p-i-n structure. We also study the effect of different encapsulants to protect the cells against atmospheric agents. We find that EQE provides information regarding the areas of the cell most susceptible to degradation, in addition to providing an estimate of the optical gap and the Urbach energy of the absorbent material. We confirm that the combined action of illumination and the environment markedly accelerate the degradation, which is reflected in the deterioration of all the parameters of the cell. The rear part of the cell is the first region to suffer the light-induced degradation. On the other hand, the cells deposited by evaporation and with a good encapsulation process are highly stable since after 30 h of exposure just a small spectral change is noticed in the red/infrared region of the EQE spectrum.

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The physics of photon induced degradation of perovskite solar cells

Cited by 59 publications

References 31 publications

Exploring Red, Green, and Blue Light‐Activated Degradation of Perovskite Films and Solar Cells for Near Space Applications

Exploring Red, Green, and Blue Light‐Activated Degradation of Perovskite Films and Solar Cells for Near Space Applications

Interplay between Ion Transport, Applied Bias, and Degradation under Illumination in Hybrid Perovskite p-i-n Devices

External quantum efficiency measurements used to study the stability of differently deposited perovskite solar cells

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