Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV16)
Publication date: 28th March 2016
As research and development efforts on perovskite solar cells continue to grow, it is important that the challenges associated with accurate efficiency measurement are addressed. These include device instability and slow stabilisation to changes in irradiance and bias voltage. As is the case with CIS- and CdTe-based devices, an important element of accurate efficiency measurement of perovskite cells is device pre-conditioning prior to measurement. Such treatments can prevent transient effects being mistaken for voltage-dependence during measurement of current-voltage curves. The high sensitivity to measurement history that has been observed for perovskite solar cells suggests that the identification of appropriate pre-conditioning treatments will be a critical step towards determining robust measurement guidelines for assessment the performance of perovskite solar cells. We find that the stabilisation time of short-circuit current and open-circuit voltage is significantly influenced by the device measurement and exposure history. For the inverted perovskite device structure investigated in this work, light-soaking periods of 5-10 minutes can be sufficient to return the device to the illuminated steady-state short-circuit current provided the device was light-soaked for 10 minutes in the previous 45 minutes. Otherwise, longer additional light-soaking periods are required. Time-scales for stabilisation are not observed to be strongly dependent on irradiance level. If sufficiently long dark relaxation periods are allowed prior to measurement, transient states that temporarily limit current generation between 0 and 100 seconds after illumination commences are readily observable in current transients. We investigate the changes device performance as it is transitioned between dark and steady-state illuminated states. The findings of this work are important information for efficiency measurement of devices that are subject to performance degradation on these timescales.
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International Conference on Hybrid and Organic Photovoltaics
International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
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