en عمومى General پژوهشي Research Owing amongst other to its high electron mobility, fullerene C70, has been widely used as an electron transporting layer in organic solar cells. In this research, we report the use of C70 thin films as electron transport layers of planar perovskite solar cells (PSCs) using a conventional device structure. The thickness of the C70 layer has been optimized to achieve the best efficiency of 12%. It is demonstrated that ultra-thin C70 films can effectively block holes and thus become selective to the transport of electrons in PSC devices.<br> &nbsp; Perovskite solar cell, CH3NH3PbI3, Electron transport layer (ETL), Fullerene, C70, Interface engineering. 15 24 http://ijop.ir/browse.php?a_code=A-10-387-6&slc_lang=en&sid=1 Fatemeh Jafari Nodoushan jafarifateme63@yahoo.com 10031947532846003104 10031947532846003104 No Physics Department, Yazd University, Yazd, Iran, Photonics Research Group, Yazd University, Yazd, Iran Abbas Behjat abehjat@yazd.ac.ir 10031947532846003105 10031947532846003105 Yes Physics Department, Yazd University, Yazd, Iran, Photonics Research Group, Yazd University, Yazd, Iran Naeimeh Torabi ntorabi.k@gmail.com 10031947532846003106 10031947532846003106 No Photonics Research Group, Yazd University, Yazd, Iran Mehrad Ahmadpour ahmadpour@mci.sdu.dk 10031947532846003107 10031947532846003107 No SDU NanoSYD, Mads Clausen Institute, University of Southern Denmark, Alsion 2, 6400 Sønderborg, Denmark Bhushan Ramesh Patil patil@mci.sdu.dk 10031947532846003108 10031947532846003108 No SDU NanoSYD, Mads Clausen Institute, University of Southern Denmark, Alsion 2, 6400 Sønderborg, Denmark Vida Turkovic engmann@mci.sdu.dk 10031947532846003109 10031947532846003109 No SDU NanoSYD, Mads Clausen Institute, University of Southern Denmark, Alsion 2, 6400 Sønderborg, Denmark Morten Madsen madsen@mci.sdu.dk 10031947532846003110 10031947532846003110 No SDU NanoSYD, Mads Clausen Institute, University of Southern Denmark, Alsion 2, 6400 Sønderborg, Denmark