Vertically aligned nanostructured TiO2 photoelectrodes for high efficiency perovskite solar cells via a block copolymer template approach. Issue 22 (19th May 2016)

• Record Type: Journal Article
• Authors: Seo, Myung-Seok; Jeong, Inyoung; Park, Joon-Suh; Lee, Jinwoo; Han, Il Ki; Lee, Wan In; Son, Hae Jung; Sohn, Byeong-Hyeok; Ko, Min Jae
• Is Part Of: Nanoscale. Volume 8:Issue 22(2016)
• Page Start: 11472
• Page End: 11479
• Publication Date: 2016-05-19
• Subjects: Nanoscience -- Periodicals; Nanotechnology -- Periodicals; 620.505
• DOI: 10.1039/c6nr01010e
• Languages: English
• ISSNs: 2040-3364

Abstract

Abstract : Using TiO2 nanorods from BCP nanotemplates, as an ETL, perovskite solar cells show an excellent PCE of 15.5%. Abstract : We fabricated perovskite solar cells with enhanced device efficiency based on vertically oriented TiO2 nanostructures using a nanoporous template of block copolymers (BCPs). The dimension and shape controllability of the nanopores of the BCP template allowed for the construction of one-dimensional (1-D) TiO2 nanorods and two-dimensional (2-D) TiO2 nanowalls. The TiO2 nanorod-based perovskite solar cells showed a more efficient charge separation and a lower charge recombination, leading to better performance compared to TiO2 nanowall-based solar cells. The best solar cells employing 1-D TiO2 nanorods showed an efficiency of 15.5% with V OC = 1.02 V, J SC = 20.0 mA cm −2 and fill factor = 76.1%. Thus, TiO2 nanostructures fabricated from BCP nanotemplates could be applied to the preparation of electron transport layers for improving the efficiency of perovskite solar cells.