Surface Polarization Model for the Dynamic Hysteresis of Perovskite Solar Cells
Autor: | Sandheep Ravishankar, Antonio Guerrero, Clara Aranda, Francisco Fabregat-Santiago, Germà Garcia-Belmonte, Juan Bisquert, Osbel Almora, Arie Zaban, C. Echeverría-Arrondo, Elnaz Ghahremanirad |
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Rok vydání: | 2017 |
Předmět: |
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Horizontal scan rate Materials science Condensed matter physics Poling Perovskite solar cell 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Polarization (waves) Elementary charge perovskite solar cells 01 natural sciences 0104 chemical sciences Ion hysteresis solar cells General Materials Science Physical and Theoretical Chemistry 0210 nano-technology perovskite Voltage |
Zdroj: | The Journal of Physical Chemistry Letters. 8:915-921 |
ISSN: | 1948-7185 |
Popis: | The dynamic hysteresis of perovskite solar cells consists of the occurrence of significant deviations of the current density-voltage curve shapes depending on the specific conditions of measurement such as starting voltage, waiting time, scan rate, and other factors. Dynamic hysteresis is a serious impediment to stabilized and reliable measurement and operation of the perovskite solar cells. In this Letter, we formulate a model for the dynamic hysteresis based on the idea that the cell accumulates a huge quantity of surface electronic charge at forward bias that is released on voltage sweeping, causing extra current over the normal response. The charge shows a retarded dynamics due to the slow relaxation of the accompanying ionic charge, that produces variable shapes depending on scan rate or poling value and time. We show that the quantitative model provides a consistent description of experimental results and allows us to determine significant parameters of the perovskite solar cell for both the transient and steady-state performance. |
Databáze: | OpenAIRE |
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