標題: A novel ball milling technique for room temperature processing of TiO2 nanoparticles employed as the electron transport layer in perovskite solar cells and modules
作者: Singh, Mriganka
Chiang, Chien-Hung
Boopathi, Karunakara Moorthy
Hanmandlu, Chintam
Li, Gang
Wu, Chun-Guey
Lin, Hong-Cheu
Chu, Chih-Wei
材料科學與工程學系
Department of Materials Science and Engineering
公開日期: 28-Apr-2018
摘要: Anatase titanium dioxide (an-TiO2) is often used as the electron transporting material (ETM) in planar-heterojunction perovskite solar cells (PSCs) because of its excellent semiconductor characteristics, outstanding optical transmittance, and suitable band structure. Herein, we report an inexpensive method for mass-scale production of TiO2 ETMs at room temperature (RT similar to 30 degrees C), involving the grinding of large clumps of an-TiO2 to form a suspension of TiO2 nanoparticles (NPs) in isopropyl alcohol for meso-superstructured PSCs. This process does not involve any chemical synthesis; it is a purely physical process. The lowest unoccupied molecular orbital (LUMO) of ground an-TiO2 NPs, estimated using ultraviolet photoelectron spectroscopy (UPS), was ca. 4.06 eV, which is a salient feature for the active layer. A regular perovskite solar cell (PSC) based on a CH3NH3PbI3 absorber and ground an-TiO2 ETL exhibited a champion power conversion efficiency (PCE) of 17.43% with an active area of 0.1 cm(2). The same ground an-TiO2 NPs were used to fabricate a large-area (designated area: 25.2 cm(2)) PSC and a PCE of 14.19% was achieved. PSC devices incorporating the ground an-TiO2 NP ETLs exhibited an attractive long-term device stability, with the PCE retaining approximately 85% of the initial values after 80 days.
URI: http://dx.doi.org/10.1039/c8ta00303c
http://hdl.handle.net/11536/144920
ISSN: 2050-7488
DOI: 10.1039/c8ta00303c
期刊: JOURNAL OF MATERIALS CHEMISTRY A
Volume: 6
起始頁: 7114
結束頁: 7122
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