Orientation-Engineered Small-Molecule Semiconductors as Dopant-Free Hole Transporting Materials for Efficient and Stable Perovskite Solar Cells

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Zhiwen Zhou
  • Qisheng Wu
  • Rui Cheng
  • Hong Zhang
  • Sijia Wang
  • Mojun Chen
  • Maohai Xie
  • Paddy Kwok Leung Chan
  • Michael Grätzel

Detail(s)

Original languageEnglish
Article number2011270
Journal / PublicationAdvanced Functional Materials
Volume31
Issue number20
Online published11 Mar 2021
Publication statusPublished - 17 May 2021
Externally publishedYes

Abstract

Crystallized p-type small-molecule semiconductors have great potential as an efficient and stable hole transporting materials (HTMs) for perovskite solar cells (PSCs) due to their relatively high hole mobility, good stability, and tunable highest occupied molecular orbitals. Here, a thienoacene-based organic semiconductor, 2,9-diphenyldinaphtho[2,3-b:2′,3′-f]thieno[3,2-b]thiophene (DPh-DNTT), is thermally evaporated and employed as the dopant-free HTM that can be scaled up for large-area fabrication. By controlling the deposition temperature, the molecular orientation is modulated into a dominant face-on orientation with ππ stacking direction perpendicular to the substrate surface, maximizing the out-of-plane carrier mobility. With an engineered face-on orientation, the DPh-DNTT film shows an improved out-of-plane mobility of 3.3 × 10−2 cm2 V−1 s−1, outperforming the HTMs reported so far. Such orientation-reinforced mobility contributes to a remarkable efficiency of 20.2% for CH3NH3PbI3 inverted PSCs with enhanced stability. The results reported here provide insights into engineering the orientation of molecules for the dopant-free organic HTMs for PSCs.

Research Area(s)

  • dopant-free, hole transport materials, MAPbI3 solar cells, mobility, molecular orientation

Citation Format(s)

Orientation-Engineered Small-Molecule Semiconductors as Dopant-Free Hole Transporting Materials for Efficient and Stable Perovskite Solar Cells. / Zhou, Zhiwen; Wu, Qisheng; Cheng, Rui et al.

In: Advanced Functional Materials, Vol. 31, No. 20, 2011270, 17.05.2021.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review