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Title: Investigation of high performance TiO2 nanorod array perovskite solar cells
Authors: Liu, CW 
Zhu, RX
Ng, A 
Ren, ZW 
Cheung, SH
Du, LL
So, SK
Zapien, JA
Djurisic, AB
Phillips, DL
Surya, C 
Issue Date: 2017
Publisher: Royal Society of Chemistry
Source: Journal of materials chemistry A, 2017, v. 5, no. 30, p. 15970-15980 How to cite?
Journal: Journal of materials chemistry A 
Abstract: In this paper, systematic investigations on the fabrication and characterization of high performance TiO2 nanorod array perovskite solar cells (NAPSCs) are reported. The TiO2 nanorods, of length around 350-400 nm, were grown by solvothermal technique directly on glass/FTO substrates. From the scanning transmission electron microscopy (STEM) we demonstrate that excellent crystallinity for the TiO2 nanorods can be produced using the solvothermal technique. Precursor consisting of a mixture of PbI2, CH3NH3I (MAI) and CH3NH3Cl (MACl) was used for the growth of perovskite thin films on the glass/FTO/ TiO2 nanorod array (TiO2-NA) substrates. It is found that the morphology and quality of the perovskite layer depend strongly on the concentration of MACl in the precursor. Experimental studies on femtosecond transient absorption (fs-TA) indicate that the incorporation of TiO2-NA greatly enhances the collection efficiency of the photo-generated carriers due to substantial increase of interfacial area between the perovskite and TiO2-NA, leading to a reduction in carrier diffusion distance. It is shown to be the key factor that the proposed technique facilitates the use of a thicker perovskite absorber layer (similar to 500 nm) without compromising on the series resistance. Detailed J-V characterization shows that the NAPSCs exhibit negligible hysteresis with a power conversion efficiency (PCE) >19% for the champion device.
ISSN: 2050-7488
EISSN: 2050-7496
DOI: 10.1039/c7ta03710d
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