Carbon nanotubes as an efficient hole collector for high voltage methylammonium lead bromide perovskite solar cells

Zhen Li; Pablo P. Boix; Guichuan Xing; Kunwu Fu; Sneha A. Kulkarni; Sudip K. Batabyal; Wenjing Xu; Anyuan Cao; Tze Chien Sum; Nripan Mathews; Lydia Helena Wong

doi:10.1039/C5NR06177F

Carbon nanotubes as an efficient hole collector for high voltage methylammonium lead bromide perovskite solar cells†

Zhen Li,^a Pablo P. Boix,^a Guichuan Xing,^b Kunwu Fu,^ac Sneha A. Kulkarni,^a Sudip K. Batabyal,^a Wenjing Xu,^d Anyuan Cao,^d Tze Chien Sum,^b Nripan Mathews^ace and Lydia Helena Wong*^ace

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* Corresponding authors

^a Energy Research Institute @ NTU (ERI@N), Nanyang Technological University, Techno Plaza, 50 Nanyang Drive, Singapore
E-mail: lydiaWong@ntu.edu.sg

^b Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore

^c School of Materials Science and Engineering, Nanyang Technological University (NTU), Block N4.1, Nanyang Avenue, Singapore

^d Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing 100871, People's Republic of China

^e Singapore-Berkeley Research Initiative for Sustainable Energy, 1 Create Way, Singapore

Abstract

A high open circuit voltage (V_OC) close to 1.4 V under AM 1.5, 100 mW cm⁻² conditions is achieved when carbon nanotubes (CNTs) are used as a hole conductor in methyl ammonium lead bromide (MAPbBr₃) perovskite solar cells. Time-resolved photoluminescence and impedance spectroscopy investigations suggest that the observed high V_OC is a result of the better charge extraction and lower recombination of the CNT hole conductor. Tandem solar cells with all perovskite absorbers are demonstrated with a MAPbBr₃/CNT top cell and a MAPbI₃ bottom cell, achieving a V_OC of 2.24 V in series connection. The semitransparent and high voltage MAPbBr₃/CNT solar cells show great potential for applications in solar cell windows, tandem solar cells and solar driven water splitting.

This article is part of the themed collection: Perovskites at the nanoscale: from fundamentals to applications

Nanoscale

Carbon nanotubes as an efficient hole collector for high voltage methylammonium lead bromide perovskite solar cells†

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