Highly Efficient and Stable Perovskite Solar Cells using a Dopant-Free Inexpensive Small Molecule as the Hole-Transporting Material


The hole transporting layer (HTL) plays an important role in realizing efficient and stable perovskite solar cells (PSCs). In spite of intensive research efforts toward the development of HTL materials, low-cost, dopant-free hole transporting materials that lead to efficient and stable PSCs remain elusive. Herein, a simple polycyclic heteroaromatic hydrocarbon-based small molecule, 2,5,9,12-tetra(tert-butyl)diacenaphtho[1,2-b:1′,2′-d]thiophenen, as an efficient HTL material in PSCs is presented. This molecule is easy to synthesize and inexpensive. It is hydrophobic and exhibits excellent film-forming properties on perovskites. It has unusually high hole mobility and a desirable highest occupied molecular orbital energy level, making it an ideal HTL material. PSCs fabricated using both the n-i-p planar and mesoscopic architectures with this compound as the HTL show efficiencies as high as 15.59% and 18.17%, respectively, with minimal hysteresis and high long term stability under ambient conditions.


Mechanical and Aerospace Engineering


This work was supported by the National Science Foundation (DMR1308577), the University of Missouri System Fast Track, and the Interdisciplinary Intercampus (IDIC) research program. Support for NMR instrumentation has been provided by the University of Missouri Research Board, University of Missouri-Kansas City (UMKC) Office of Research Administration, and the UMKC College of Arts and Sciences.

Keywords and Phrases

Hole-transporting Materials; Perovskite Solar Cells; Polycyclic Heteroaromatic Hydrocarbons; Small-molecule Semiconductors

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Article - Journal

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Publication Date

01 Aug 2018