title: Blending of n-type Semiconducting Polymer and PC61BM for an Efficient Electron-Selective Material to Boost the Performance of the Planar Perovskite Solar Cell.
abstract: The highly efficient CH3NH3PbI3 perovskite solar cell (PeSC) is simply achieved by employing a blended electron-transport layer (ETL) consisting of PC61BM and P(NDI2OD-T2). The high molecular weight of P(NDI2OD-T2) allows for a thinned ETL with a uniform morphology that optimizes the PC61BM ETL more effectively. As a result of this enhancement, the power conversion efficiency of a PC61BM:P(NDI2OD-T2)-based PeSC is 25% greater than that of the conventional PC61BM based-PeSC; additionally, the incorporation of P(NDI2OD-T2) into PC61BM attenuates the dependence of the PeSC on the ETL-processing conditions regarding its performance. It is revealed that, in addition to the desirable n-type semiconducting characteristics of PC61BM:P(NDI2OD-T2)-including a higher electron-mobility and a more-effective electron selectivity of a blended ETL for an efficient electron extraction-the superior performance of a PC61BM:P(NDI2OD-T2) device is the result of a thinned and uniformly covered ETL on the perovskite layer.
authors.affiliation: Professional Graduate School of Flexible and Printable Electronics and Polymer Materials Fusion Research Center, Chonbuk National University , Jeonju-si, Jeollabuk-do 561-756, Republic of Korea.
authors.forename: You-Hyun
authors.initials: YH
authors.lastname: Seo
authors.forename: Jun-Seok
authors.initials: JS
authors.lastname: Yeo
authors.forename: NoSoung
authors.initials: N
authors.lastname: Myoung
authors.forename: Sang-Youp
authors.initials: SY
authors.lastname: Yim
authors.forename: Minji
authors.initials: M
authors.lastname: Kang
authors.forename: Dong-Yu
authors.initials: DY
authors.lastname: Kim
authors.affiliation: Professional Graduate School of Flexible and Printable Electronics and Polymer Materials Fusion Research Center, Chonbuk National University , Jeonju-si, Jeollabuk-do 561-756, Republic of Korea.
authors.forename: Seok-In
authors.initials: SI
authors.lastname: Na
keywords: charge extractions; interfacial layers; perovskite solar cells; planar structures; polymer binders; small molecules