title: Near-Infrared-Absorbing and Dopant-Free Heterocyclic Quinoid-Based Hole-Transporting Materials for Efficient Perovskite Solar Cells.
abstract: New heterocyclic quinoid-based hole transporting materials (HTMs) with a rigid quinoid core [3,6-di(2H-imidazol-2-ylidene)cyclohexa-1,4-diene] have been synthesized. The new HTMs have good hole mobility (>10-4cm2V-1s-1) and very intense absorption in the near-infrared region extending to >800 nm. High performance perovskite solar cells can be fabricated using these HTMs without dopant. The best cell efficiency under simulated AM 1.5 G illumination reaches 12.22 %, which is comparable with that (12.58 %) using doped 2,2',7,7'-tetrakis-(N,N-di-4-methoxyphenylamino)-9,9'-spirobifluorene (spiro-OMeTAD) as the HTM.
authors: Institute of Chemistry, Academia Sinica, Nankang, Taipei, 11529, Taiwan.
authors: Jen-Shyang
authors: JS
authors: Ni
authors: Department of Materials Science and Engineering, National Taiwan University, Da'an, Taipei, 10617, Taiwan.|NTU Center for Condensed Matter Sciences, National Taiwan University, Da'an, Taipei, 10617, Taiwan.
authors: Hsiao-Chi
authors: HC
authors: Hsieh
authors: Institute of Chemistry, Academia Sinica, Nankang, Taipei, 11529, Taiwan.|Department of Chemistry, National Central University, Taoyuan, 32001, Taiwan.
authors: Chun-An
authors: CA
authors: Chen
authors: Institute of Chemistry, Academia Sinica, Nankang, Taipei, 11529, Taiwan.
authors: Yuh-Sheng
authors: YS
authors: Wen
authors: Institute of Chemistry, Academia Sinica, Nankang, Taipei, 11529, Taiwan.
authors: Wen-Ti
authors: WT
authors: Wu
authors: Department of Materials Science and Engineering, National Taiwan University, Da'an, Taipei, 10617, Taiwan.
authors: Yen-Chen
authors: YC
authors: Shih
authors: Department of Materials Science and Engineering, National Taiwan University, Da'an, Taipei, 10617, Taiwan.|Institute of Polymer Science and Engineering, National Taiwan University, Taipei, 10617, Taiwan.
authors: King-Fu
authors: KF
authors: Lin
authors: NTU Center for Condensed Matter Sciences, National Taiwan University, Da'an, Taipei, 10617, Taiwan.|Institute of Polymer Science and Engineering, National Taiwan University, Taipei, 10617, Taiwan.
authors: Leeyih
authors: L
authors: Wang
authors: Institute of Chemistry, Academia Sinica, Nankang, Taipei, 11529, Taiwan.|Department of Chemistry, National Central University, Taoyuan, 32001, Taiwan.
authors: Jiann T
authors: JT
authors: Lin
mesh_terms: D065966:Absorption, Physicochemical; D017610:Calcium Compounds / Q000737:chemistry*; D011211:Electric Power Supplies; D006571:Heterocyclic Compounds / Q000737:chemistry*; D007259:Infrared Rays; D008958:Models, Molecular; D008968:Molecular Conformation; D010087:Oxides / Q000737:chemistry*; D011809:Quinones / Q000737:chemistry*; D012993:Solar Energy; D014025:Titanium / Q000737:chemistry*
chemical_list: D017610:Calcium Compounds; D006571:Heterocyclic Compounds; D010087:Oxides; D011809:Quinones; C059910:perovskite; D014025:Titanium
keywords: dopant-free; hole-transport material; near-infrared; perovskite solar cells; quinoid