Facile synthesis of fluorene-based hole transport materials for highly efficient perovskite solar cells and solid-state dye-sensitized solar cells. (August 2016)

• Record Type: Journal Article
• Authors: Hua, Yong; Zhang, Jinbao; Xu, Bo; Liu, Peng; Cheng, Ming; Kloo, Lars; Johansson, Erik M.J.; Sveinbjörnsson, Kári; Aitola, Kerttu; Boschloo, Gerrit; Sun, Licheng
• Is Part Of: Nano energy. Volume 26(2016:Aug.)
• Page Start: 108
• Page End: 113
• Publication Date: 2016-08
• Subjects: Fluorene -- Hole-transport material -- Perovskite solar cells -- Solid-state dye sensitized solar cell; Nanoscience -- Periodicals; Nanotechnology -- Periodicals; Nanostructured materials -- Periodicals; Power resources -- Technological innovations -- Periodicals; Nanoscience; Nanostructured materials; Nanotechnology; Power resources -- Technological innovations; Periodicals; 621.042
• DOI: 10.1016/j.nanoen.2016.05.006
• Languages: English
• ISSNs: 2211-2855

Abstract

Abstract: Two novel low-cost fluorene-based hole transport materials (HTMs)HT1 andHT2 as alternatives to the expensive HTMSpiro-OMeTAD have been designed and synthesized for the application in perovskite solar cells (PSCs) and solid-state dye-sensitized solar cell (ssDSCs). The two HTMs were prepared through a facile two-step reaction from cheap starting material and with a total yield higher than 90%. These HTMs exhibit good solubility and charge-transport ability. PSCs based onHT2 achieved power conversion efficiency (PCE) of 18.04% under air conditions, which is comparable to that of the cell employing the commonly usedSpiro-OMeTAD (18.27%), whileHT1 -based cell showed a slightly worse performance with a PCE of 17.18%. For ssDSCs, theHT2 -based device yielded a PCE of 6.35%, which is also comparable to that of a cell fabricated based onSpiro-OMeTAD (6.36%). We found that the larger dimensional structure and molecular weight ofHT2 enable better photovoltaic performance than that of the smaller oneHT1 . These results show that easily synthesized fluorene-based HTMs have great potential to replace the expensiveSpiro-OMeTAD for both PSCs and ssDSCs. Graphical abstract: Highlights: Fluorene-based hole transport materials (HTMs) have been designed and applied in perovskite solar cells (PSCs) and solid-state dye-sensitized solar cell (ssDSCs). The new HTMs were prepared through a facile two-step reaction in a total yield higher than 90%. Devices withHT2 as HTM showed high PCEs of 18.04% in PSCs and 6.35% in ssDSCs under 100 mW cm −2 AM1.5 G solar illumination. More extended three-dimensional structure and higher molecular weight of HTMs enable better photovoltaic performance.