Oxasmaragdyrins as New and Efficient Hole-Transporting Materials for High-Performance Perovskite Solar Cells

Sandeep B. Mane, Albertus Adrian Sutanto, Chih Fu Cheng, Meng Yu Xie, Chieh I. Chen, Mario Leonardus, Shih Chieh Yeh, Belete Bedemo Beyene, Wei-Guang Diau, Chin Ti Chen, Chen Hsiung Hung*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

The high performance of the perovskite solar cells (PSCs) cannot be achieved without a layer of efficient hole-transporting materials (HTMs) to retard the charge recombination and transport the photogenerated hole to the counterelectrode. Herein, we report the use of boryl oxasmaragdyrins (SM01, SM09, and SM13), a family of aromatic core-modified expanded porphyrins, as efficient hole-transporting materials (HTMs) for perovskite solar cells (PSCs). These oxasmaragdyrins demonstrated complementary absorption spectra in the low-energy region, good redox reversibility, good thermal stability, suitable energy levels with CH3NH3PbI3 perovskite, and high hole mobility. A remarkable power conversion efficiency of 16.5% (Voc = 1.09 V, Jsc = 20.9 mA cm-2, fill factor (FF) = 72%) is achieved using SM09 on the optimized PSCs device employing a planar structure, which is close to that of the state-of-the-art hole-transporting materials (HTMs), spiro-OMeTAD of 18.2% (Voc = 1.07 V, Jsc = 22.9 mA cm-2, FF = 74%). In contrast, a poor photovoltaic performance of PSCs using SM01 is observed due to the interactions of terminal carboxylic acid functional group with CH3NH3PbI3.

Original languageEnglish
Pages (from-to)31950-31958
Number of pages9
JournalACS Applied Materials and Interfaces
Volume9
Issue number37
DOIs
StatePublished - 20 Sep 2017

Keywords

  • boryl oxasmaragdyrin
  • core modification
  • hole-transporting material
  • perovskite solar cells
  • porphyrin

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