TiO₂ Nanoparticles/Nanotubes for Efficient Light Harvesting in Perovskite Solar Cells

Hwa-Young Yang; Won-Yeop Rho; Seul Ki Lee; Sang Hoon Kim; Yoon-Bong Hahn

doi:10.3390/nano9030326

TiO₂ Nanoparticles/Nanotubes for Efficient Light Harvesting in Perovskite Solar Cells

Nanomaterials (Basel). 2019 Mar 1;9(3):326. doi: 10.3390/nano9030326.

Authors

Hwa-Young Yang¹, Won-Yeop Rho², Seul Ki Lee³, Sang Hoon Kim⁴, Yoon-Bong Hahn⁵

Affiliations

¹ School of Semiconductor and Chemical Engineering, Solar Energy Research Center, Chonbuk National University, Jeollabuk-do 54896, Korea. shot7108@gmail.com.
² School of International Engineering and Science, Chonbuk National University, 567 Baekje-daero, Deokjin-gu, Jeonju-si, Jeollabuk-do 54896, Korea. rho7272@jbnu.ac.kr.
³ School of Semiconductor and Chemical Engineering, Solar Energy Research Center, Chonbuk National University, Jeollabuk-do 54896, Korea. kalyber@naver.com.
⁴ School of Semiconductor and Chemical Engineering, Solar Energy Research Center, Chonbuk National University, Jeollabuk-do 54896, Korea. semikim77@gmail.com.
⁵ School of Semiconductor and Chemical Engineering, Solar Energy Research Center, Chonbuk National University, Jeollabuk-do 54896, Korea. ybhahn@chonbuk.ac.kr.

Abstract

To enhance the light harvesting capability of perovskite solar cells (PSCs), TiO₂ nanoparticles/nanotubes (TNNs) were incorporated into the active layer of PSCs. The TNN-containing cells showed a substantial increase in photocurrent density (J_SC), from 23.9 mA/cm² without nanotubes to 25.5 mA/cm², suggesting that the TiO₂ nanotubes enhanced the charge conduction and harvested more sunlight, which was attributed to the Mie scattering effect. Compared to the power conversion efficiency (PCE) of TiO₂ nanoparticles in the active layer (14.16%), the TNN-containing cells with optimal loading of 9 wt % TiO₂ nanotubes showed a high PCE of 15.34%.

Keywords: TiO2 nanotube arrays; anodization; light harvesting; perovskite solar cells.

Grants and funding

CBNU2017/Chonbuk National University