《Table 1 Photovoltaic parameters of the devices at the starting point in near space (35 km above the

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《Mixed-cation perovskite solar cells in space》

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Figure 2（a-i）shows the temperature variation of the devices in near space（35 km above the Earth）.The temperature continuously increased from 1.9°C to 69.6°C during the level flight owing to the strong solar radiation and little heat convection in near space.The corresponding real-time light intensity is shown in Figure 2（a-ii）.Further，the fluctuations in temperature and light intensity can be explained by the rotation of the pod，which alters the angle of the Sun striking the platform.We mainly discuss the performance of devices under stable irradiation during the level flight.As the starting point，we chose the time at which the light intensity up to136.7 mW cm-2，corresponding to temperature at 26.7°C.The photovoltaic parameters of the devices at the starting point are presented in Table 1.Further，the intensive solar radiation in near pace，especially UV radiation，affects the materials in solar cells[15].To investigate the variation in the device performance，we covered the devices with polyimide（PI）filter and measured the transmittance spectrum of the FTO substrate.The spectra of the FTO substrates with or w/o PI are depicted in Figure 2（b）.After covering with PI，the transmittance of the FTO substrate was observed to reduce between 300 and 570 nm.Specifically，the transmittance reduced from 82%to 22%at～430 nm.The difference between the transmittance spectra confirms that the PI filtered majority of the UV radiation.