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Since the first report on a long\u2010term\u2010durable, 9.7\u2009% efficient, solid\u2010state perovskite solar cell, organic\u2013inorganic halide perovskites have received considerable attention because of their excellent optoelectronic properties. As a result, a power conversion efficiency (PCE) exceeding 22\u2009% was certified. Controlling the grain size, grain boundary, morphology, and defects of the perovskite layer is important for achieving high efficiency. In addition, interfacial engineering is equally or more important to further improve the PCE through better charge collection and a reduction in charge recombination. In this Review, the type of interfacial layers and their impact on photovoltaic performance are investigated for both the normal and the inverted cell architectures. Four different interfaces of fluorine\u2010doped tin oxide (FTO)\/electron\u2010transport layer (ETL), ETL\/perovskite, perovskite\/hole\u2010transport layer (HTL), and HTL\/metal are classified, and their roles are investigated. The effects of interfacial engineering with organic or inorganic materials on photovoltaic performance are described in detail. Grain\u2010boundary engineering is also included because it is related to interfacial engineering and the grain boundary in the perovskite layer plays an important role in charge conduction, recombination, and chargecarrier life time.<\/jats:p>","DOI":"10.1002\/cssc.201701095","type":"journal-article","created":{"date-parts":[[2017,7,23]],"date-time":"2017-07-23T22:32:36Z","timestamp":1500849156000},"page":"3687-3704","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":276,"title":["Impact of Interfacial Layers in Perovskite Solar Cells"],"prefix":"10.1002","volume":"10","author":[{"given":"An\u2010Na","family":"Cho","sequence":"first","affiliation":[{"name":"School of Chemical Engineering and Department of Energy Science Sungkyunkwan University, SKKU  Suwon 440-746 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