Yun, Jae Hoon Lee, Inhwa Kim, Taek-Soo Ko, Min Jae Kim, Jin Young Son, Hae Jung 2024-01-20T06:00:37Z 2024-01-20T06:00:37Z 2021-09-04 2015-11 2050-7488 https://pubs.kist.re.kr/handle/201004/124850 High performance perovskite solar cells with high stability in moist air are required for their practical applications. We have developed a simple approach to enhance device stability via the introduction of a polyethyleneimine (PEI) compatibilizer between the perovskite (CH3NH3PbI3) and upper hole transporting material layers (HTMs). The PEI effectively reduces moisture intrusion into the CH3NH3PbI3 layer under a high humidity condition. Moreover, the incorporation of PEI increases the adhesion at the CH3NH3PbI3/HTM interface, which allows the protective HTMs to strongly adhere onto the CH3NH3PbI3 layer during degradation and significantly decreases the direct exposure of CH3NH3PbI3 to moist air. As a result, the solar cell device was found to exhibit remarkably improved moisture stability, maintaining a performance of 85% for 14 days of exposure to 85% relative humidity without any encapsulation. We investigated the effects of the PEI introduction on the perovskite solar cell properties and demonstrated for the first time that the strong adhesion of the CH3NH3PbI3/HTM layer results in a perovskite solar cell device that is not only mechanically stable but also exhibits high long-term stability. English ROYAL SOC CHEMISTRY HIGH-PERFORMANCE STATE EFFICIENCY TRANSFORMATION DEPOSITION ADDUCTS LAYER FILMS Synergistic enhancement and mechanism study of mechanical and moisture stability of perovskite solar cells introducing polyethylene-imine into the CH3NH3PbI3/HTM interface Article 10.1039/c5ta06008g 1 JOURNAL OF MATERIALS CHEMISTRY A, v.3, no.44, pp.22176 - 22182 JOURNAL OF MATERIALS CHEMISTRY A 3 44 22176 22182 scie scopus 000364080400028 2-s2.0-84946430866 Chemistry, Physical Energy & Fuels Materials Science, Multidisciplinary Chemistry Energy & Fuels Materials Science Article HIGH-PERFORMANCE STATE EFFICIENCY TRANSFORMATION DEPOSITION ADDUCTS LAYER FILMS perovskite solar cell stability