The Stability Of Perovskite Solar Cell Based On The Structure Regulation Of HTL And Perovskite Thin Film

Perovskite solar cells?PSCs?have attracted great attention attributing to its easy preparation processes,low cost and excellent photoelectric conversion performance in recent years,as their efficiency has risen from initial 3.8%to 22.7%.However,the industrialization of PSCs suffered stability problems.In this paper,the researches of the stability based on p-i-n structure perovskite solar cells were as follows:The mechanism of perovskite decomposition induced by PEDOT:PSS was researched.PEDOT:PSS doped mild base for neutralizing the-SO₃H of the surface of PEDOT:PSS was to restrain the perovskite decomposition processes induced by–SO₃H.Additional,the conductivity and crystallization of PEDOT:PSS doped by LiOH were significantly improved.Finally,the power conversion efficiency and the stability of devices doped LiOH were improved 11%and 25%respectively.The NiO_x as a new hole-transport material has an obvious effect on the improvement for the photovoltaic performance of PSCs compared to the traditional hole-transport material PEDOT:PSS.The morphology and electrical properties of NiO_x and PEDOT:PSS were researched.The results showed that the NiO_x films possess greater roughness and better hydrophobicity than PEDOT:PSS films,and their surface characteristics benefit for the crystallizing uniformity of perovskite films and avoiding the formation of defects effectively.The conductivity of PEDOT:PSS decreased gradually attributing to the water absorbing process with the severe hygroscopic property of PEDOT:PSS.However,the conductivity of metal oxides NiO_x decreased unobviously attributing to the self-doping effect,which improved the stability of the device in air.The stability of PSCs devices were limited by the stability of perovskite films,so GaAA₃ was doped in perovskite precursor solution to improve the stability.The waterproof performance of the perovskite was significantly improved and the grain boundary defect of perovskite films were passivated.Finally,PSCs doped GaAA₃ in wet environments exihibited excellent hydrothermal stability.The doped devices show excellent photoelectric conversion efficiency and hydrothermal stability.The results provide a new method to solve the stability of PSCs.