Performance enhancement of perovskite solar cell by controlling deposition temperature of copper phthalocyanine as a dopant-free hole transporting layer

In this study, an efficient perovskite solar cell is introduced using dopant-free and needle-like copper phthalocyanine (CuPc) in role of a hole selective layer. The needle-like structure was obtained by controlling the substrate temperature during deposition of CuPc. The photovoltaic cell power conversion efficiency was 14.89%, which is approximately similar to that of devices using a conventional doped 2,2',7,7'-tetrakis(N, N0-di-p-methoxyphenylamine)-9, 9'-spirobifluorene (Spiro-OMeTAD) hole transport material under the same conditions. This study demonstrates thermally evaporated CuPc can be used independently with no additive materials, and it can be an efficient hole selective material to fabricate low-cost perovskite solar cells. (C) 2017 Elsevier B.V. All rights reserved.