This high efficiency flexible perovskite solar
Flexible solar cells have aroused great interest due to their exceptional properties of flexibility, portability and light weight. These features hold promise for applications in areas such as portable power sources, building integrated photovoltaics, and aerospace. Perovskite is considered to be an ideal material for the preparation of flexible solar cells, as most perovskite thin films and suitable hole transport layers (HTL) can be fabricated at low temperature (2, a relatively high temperature is generally required (> 180 ℃). High temperature like this will cause deformation of flexible substrates. Therefore, a bottleneck for highly efficient flexible perovskite solar cells (f-PSC) is to realize high quality ETLs at low temperature.
Recently, a group led by Professor Yiqiang Zhan of Fudan University reported high efficiency f-PSCs by annealing a SnO2 ETL in coarse vacuum at low temperature (100 ℃), and the best f-PSC efficiency of 20.14% was obtained. SnO2 the layers that were prepared by this method showed higher roughness and hydrophobicity compared to samples prepared in an air atmosphere and temperatures of 100 ° C, leading to improved ETL / perovskite interface connection and reducing faults in SnO2/ Perovskite interface. The proper density of the oxygen vacancies on the surface during this treatment may be responsible for higher conductivity, which is beneficial for charge transfer.
This work suggests that in addition to high temperature annealing, controlling the partial pressure of oxygen is also effective in achieving high conductivity for metal oxides even at low temperatures, which is significant for flexible electronics.
When a vacuum annealing method in SnO2 The fabrication of the low temperature electron transport layer (100) was used in this study, remarkable open circuit voltage (1.14 V) and efficiency (20.14%) were obtained for PSCs with flexible polyethylene terephthalate substrates.
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