National Center for Nanotechnology has made progress in the interface modification of perovskite solar cells

Device Efficiency and Environmental Stability Before and After Interfacial Modification of Perovskite Solar Cells

Recently, Zhou Huiqiong's team at the National Nanosciences Center of the Chinese Academy of Sciences introduced the biopolymer heparin sodium into the cathode interface of a perovskite solar cell, acting as a molecular bridge between the TiO2 and MAPbI3 layers, inactivating interface defects, and simultaneously Improved device efficiency and stability. The results of this study were published online in the magazine Advanced Materials by A Biopolymer Heparin Sodium Interlayer Anchoring TiO2 and MAPbI3 Enhances Trap Passivation and Device Stability in Perovskite Solar Cells.

In recent years, organic-inorganic hybrid perovskite solar cells have caused an upsurge of energy conversion research due to their high-efficiency and low-cost characteristics. However, defects in the active layer or interface can seriously affect the device performance and stability of the perovskite battery.

Zhou Huiqiong's research group bridged the TiO2 and MAPbI3 layers with heparin sodium molecules and studied their effects on defect passivation and device attenuation. The introduction of the interface layer simultaneously passivates the bulk defects in the perovskite active layer and interface defects between the TiO2/MAPbI3 interfaces, thereby increasing the device efficiency from 17.2% to 20.1%, and suppressing the hysteresis loop phenomenon and Defect-induced charge recombination. The stability of the modified device has also been greatly improved. After being placed in the air for 70 days, it still maintains an initial efficiency of 85%. DFT theoretical calculations show that heparin sodium molecules interact via various functional groups (-COO-, -SO3-, or Na+) with Ti4+ in TiO2, and Pb2+ and I- in MAPbI3. This study describes a highly simple and feasible method of interfacial modification of perovskite cells using biomolecules to improve device performance.

The study was a further extension of the earlier research work of Zhou Huiqiong's group (Chem. Eur. J. 2017, 23, 18140), with the Shi Xinghua Group (theoretical calculations) and the Xiaohui Group (Kelvin probe test) of the National Nano Center. The Zhang Yuan Group of the Beijing University of Aeronautics and Astronautics (component physics test) worked together and the research was supported by the Chinese Academy of Sciences’ 100-person plan and the National Natural Science Foundation of China.

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