title: Recent Advances in Interface Engineering for Planar Heterojunction Perovskite Solar Cells.
abstract: Organic-inorganic hybrid perovskite solar cells are considered as one of the most promising next-generation solar cells due to their advantages of low-cost precursors, high power conversion efficiency (PCE) and easy of processing. In the past few years, the PCEs have climbed from a few to over 20% for perovskite solar cells. Recent developments demonstrate that perovskite exhibits ambipolar semiconducting characteristics, which allows for the construction of planar heterojunction (PHJ) perovskite solar cells. PHJ perovskite solar cells can avoid the use of high-temperature sintered mesoporous metal oxides, enabling simple processing and the fabrication of flexible and tandem perovskite solar cells. In planar heterojunction materials, hole/electron transport layers are introduced between a perovskite film and the anode/cathode. The hole and electron transporting layers are expected to enhance exciton separation, charge transportation and collection. Further, the supporting layer for the perovskite film not only plays an important role in energy-level alignment, but also affects perovskite film morphology, which have a great effect on device performance. In addition, interfacial layers also affect device stability. In this review, recent progress in interfacial engineering for PHJ perovskite solar cells will be reviewed, especially with the molecular interfacial materials. The supporting interfacial layers for the optimization of perovskite films will be systematically reviewed. Finally, the challenges remaining in perovskite solar cells research will be discussed.
authors.affiliation: School of Electronic Science and Engineering, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China. ericeyin@foxmail.com.
authors.forename: Wei
authors.initials: W
authors.lastname: Yin
authors.affiliation: School of Electronic Science and Engineering, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China. ljpan@nju.edu.cn.
authors.forename: Lijia
authors.initials: L
authors.lastname: Pan
authors.affiliation: Department of Materials Science and Engineering, South University of Science and Technology of China, Shenzhen 518055, China. yangtb@sustc.edu.cn.
authors.forename: Tingbin
authors.initials: T
authors.lastname: Yang
authors.affiliation: Department of Materials Science and Engineering, South University of Science and Technology of China, Shenzhen 518055, China. liangyy@sustc.edu.cn.
authors.forename: Yongye
authors.initials: Y
authors.lastname: Liang
mesh_terms: D017610:Calcium Compounds / Q000737:chemistry*; D055664:Electrochemical Techniques; D004563:Electrochemistry; D008670:Metals; D010087:Oxides / Q000737:chemistry*; D055668:Photochemical Processes; D010777:Photochemistry; D012993:Solar Energy; D014025:Titanium / Q000737:chemistry*
chemical_list: D017610:Calcium Compounds; D008670:Metals; D010087:Oxides; C059910:perovskite; D014025:Titanium
keywords: molecular interfacial materials; perovskite solar cell; planar heterojunction