title: Integrated perovskite/bulk-heterojunction toward efficient solar cells.
abstract: We successfully demonstrated an integrated perovskite/bulk-heterojunction (BHJ) photovoltaic device for efficient light harvesting and energy conversion. Our device efficiently integrated two photovoltaic layers, namely a perovskite film and organic BHJ film, into the device. The device structure is ITO/TiO2/perovskite/BHJ/MoO3/Ag. A wide bandgap small molecule DOR3T-TBDT was used as donor in the BHJ film, and a power conversion efficiency (PCE) of 14.3% was achieved in the integrated device with a high short circuit current density (JSC) of 21.2 mA cm(-2). The higher JSC as compared to that of the traditional perovskite/HTL (hole transporting layer) device (19.3 mA cm(-2)) indicates that the BHJ film absorbs light and contributes to the current density of the device. Our result further suggests that the HTL in traditional perovskite solar cell, even with good light absorption capability, cannot contribute to the overall device photocurrent, unless this HTL becomes a BHJ layer (by adding electron transporting material like PC71BM).
authors.affiliation: Department of Materials Science and Engineering, University of California , Los Angeles, California 90095, United States.
authors.forename: Yongsheng
authors.initials: Y
authors.lastname: Liu
authors.forename: Ziruo
authors.initials: Z
authors.lastname: Hong
authors.forename: Qi
authors.initials: Q
authors.lastname: Chen
authors.forename: Weihsuan
authors.initials: W
authors.lastname: Chang
authors.forename: Huanping
authors.initials: H
authors.lastname: Zhou
authors.forename: Tze-Bin
authors.initials: TB
authors.lastname: Song
authors.forename: Eric
authors.initials: E
authors.lastname: Young
authors.forename: Yang Michael
authors.initials: YM
authors.lastname: Yang
authors.forename: Jingbi
authors.initials: J
authors.lastname: You
authors.forename: Gang
authors.initials: G
authors.lastname: Li
authors.forename: Yang
authors.initials: Y
authors.lastname: Yang
keywords: bulk heterojunction; carrier recombination; perovskite; photoresponse; photovoltaic