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Title: The origin of high efficiency in low-temperature solution-processable bilayer organometal halide hybrid solar cells
Authors: Sun, Shuangyong
Salim, Teddy
Mathews, Nripan
Duchamp, Martial
Boothroyd, Chris
Xing, Guichuan
Sum, Tze Chien
Lam, Yeng Ming
Keywords: DRNTU::Engineering::Materials::Photonics and optoelectronics materials
Issue Date: 2014
Source: Sun, S., Salim, T., Mathews, N., Duchamp, M., Boothroyd, C., Xing, G., et al. (2013). The origin of high efficiency in low-temperature solution-processable bilayer organometal halide hybrid solar cells. Energy & environmental Science, 7(1), 399-407.
Series/Report no.: Energy & environmental science
Abstract: This work reports a study into the origin of the high efficiency in solution-processable bilayer solar cells based on methylammonium lead iodide (CH3NH3PbI3) and [6,6]-phenyl-C61-butyric acid methyl ester (PC61BM). Our cell has a power conversion efficiency (PCE) of 5.2% under simulated AM 1.5G irradiation (100 mW cm−2) and an internal quantum efficiency of close to 100%, which means that nearly all the absorbed photons are converted to electrons and are efficiently collected at the electrodes. This implies that the exciton diffusion, charge transfer and charge collection are highly efficient. The high exciton diffusion efficiency is enabled by the long diffusion length of CH3NH3PbI3 relative to its thickness. Furthermore, the low exciton binding energy of CH3NH3PbI3 implies that exciton splitting at the CH3NH3PbI3/PC61BM interface is very efficient. With further increase in CH3NH3PbI3 thickness, a higher PCE of 7.4% could be obtained. This is the highest efficiency attained for low temperature solution-processable bilayer solar cells to date.
DOI: 10.1039/C3EE43161D
Schools: School of Materials Science and Engineering 
School of Physical and Mathematical Sciences 
Research Centres: Energy Research Institute @ NTU (ERI@N) 
Rights: This article is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported Licence.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:ERI@N Journal Articles
MSE Journal Articles
SPMS Journal Articles

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