Efficient Plastic Perovskite Solar Cell with a Low-Temperature Processable Electrodeposited TiO2 Compact Layer and a Brookite TiO2 Scaffold

5 years ago

Efficient Plastic Perovskite Solar Cell with a Low-Temperature Processable Electrodeposited TiO2 Compact Layer and a Brookite TiO2 Scaffold

Ssu-Yu Lin, Pei-Chia Lo, Tzu-Sen Su, Tzu-Chien Wei, Tsung-Yu Hsieh

Recent research on fabricating scaffold-type perovskite solar cells on plastic substrates has reported noteworthy progress in replacing the high-temperature processing of TiO2 scaffolds and compact layers with various low-temperature processes. Herein, recent progress in the laboratory is reported regarding the development of electrodeposited TiOx compact layers and brookite TiO2 scaffolds, both of which can be processed under 150 °C without greatly sacrificing their photovoltaic performance. Through systematic characterization of device properties and careful optimization of the fabrication conditions, a record-high 15.76% power conversion efficiency of a plastic TiO2 scaffold-type perovskite solar cell is demonstrated. In addition, bending durability and preliminary stability tests on this plastic perovskite solar cell show promising results and indicate clear directions for future improvement. An efficient plastic perovskite solar cell with a mesoporous scaffold structure is fabricated by using a low-temperature processable electrodeposited TiOx compact layer and spin-coated brookite TiO2 scaffold. The electrodeposition TiOx compact layer exhibits suitable morphology, favorable band position, and an extraordinary hole-blocking effect, while brookite TiO2 offers the capability to form a tightly packed scaffold without the need of sintering. Bending and dry-storage stability assessments are taken and showed promising results and clear direction of future improvements.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/aenm.201700169