2-巯基嘧啶界面钝化改善钙钛矿太阳电池性能

该文研究2-巯基嘧啶（2-MP）对三元阳离子钙钛矿太阳电池光吸收层与空穴传输层的界面进行钝化,钝化改善薄膜及器件的光电性能。瞬态和稳态光致发光荧光光谱表征结果说明钝化后的钙钛矿薄膜非辐射复合被抑制。这均有利于抑制载流子复合和提升开路电压。钝化后薄膜疏水性增强,更好地阻挡水汽侵蚀,提升稳定性。光强依赖性测试结果表明2-MP有效地钝化缺陷。J-V测试表明钝化后器件光电性能明显改善,开路电压最高达1.133 V,效率最高达21.66%。并且优化器件的稳定性显著改善,在氮气中储存97 d后效率保持初始效率的90%。

INTERFACIAL PASSIVATION FOR ENHANCED PERFORMANCE OF PEROVSKITE SOLAR CELLS VIA BY 2-MERCAPTOPYRIMIDINE

It was investigated that 2-mercaptopyrimidine （2-MP） passivated the interface between the perovskite layer and hole transport layer of a triple cation perovskite solar cell, which improved the photoelectric properties of the film and the device. Steady-state and time-resolved photoluminescence fluorescence spectrum characterization results showed that non-radiative recombination of the passivated perovskite film was suppressed. In addition, the work function characterizations by KPFM illustrated that the energy level of PVK/2-MP/Spiro matched better than that of PVK/2-MP/Spiro, that is beneficial to suppress carrier recombination and enhance open-circuit voltage. After passivation, the hydrophobicity of the film was enhanced which is helpful to block water vapor erosion and improve stability. The open-circuit voltage dependence on light intensity shows that 2-MP effectively passivates the interface defects and suppress the non-radiative recombination of carriers. The J-V test showed that the photoelectric performance of the device was significantly improved with passivation, the open-circuit voltage was up to 1.133 V, and the efficiency was up to 21.66%. Moreover, the stability of the optimized device was significantly improved. After 97 days of storage in nitrogen, the efficiency maintained 90% of the initial efficiency.