TY - GEN
T1 - The Investigation of TiO2 Nanostructures on Performance of Perovskite Solar Cells
AU - Ren, Zhiwei
AU - Liu, Changwen
AU - Ng, Annie
AU - Surya, Charles
N1 - Funding Information:
This work has demonstrated the impact of different morphology TiO2 on the performance of PSCs. We have investigated 3 types of TiO2 including c-TiO2, mp-TiO2 and TiO2-NR. It is found that the nanostructures of the TiO2 can greatly enhance the interfacial area between the ETL and perovskite layer, which can shorten the carrier diffusion distance and thus facilitate the carrier transfer within the device. After optimizing the TiO2 nanostructures and the perovskite growth technique, a PCE of 19 % without hysteresis can be obtained for the champion PSC. Acknowledgment This work was supported by a GRF grant (Grant No. PolyU 152045/15E) and the Clarea Au Endowment Professorship. Special thanks are given to Prof. Phillips and Dr. Zhu for professional assistance in fs-TA measurement. References [1] A.Kojima,K.Teshima,Y.Shirai,T.Miyasaka,“Organometalhalide perovskites as visible-light sensitizers for photovoltaic cells,” J. Am. Chem. Soc. Vol. 131, 6050-6051 (2009).
Publisher Copyright:
© 2018 IEEE.
PY - 2018/10/9
Y1 - 2018/10/9
N2 - In this work, we have studied the effects of the compact TiO2 (c-TiO2) and mesoscopic TiO2 (mp-TiO2) layers on the performance of the perovskite based solar cells (PSCs). It is found that the increased interfacial area between the mesoscopic electron transport layer (ETL) and perovskite can enhance the device efficiency, particularly for the fill factor. We have then synthesized TiO2 nanorods (TiO2-NR) and incorporated it into PSCs, in which the interfacial area between perovskite and TiO2-NA is further increased. A hysteresis-free PSC with the power conversion efficiency (PCE) of 19 % can be obtained by using TiO2-NR as the ETL. The results of femtosecond transient absorption (fs-TA) clearly show that the carrier extraction efficiency is significantly enhanced due to substantial increase of the interfacial area between the perovskite and ETL nanostructures, resulting in a reduction in carrier diffusion distance.
AB - In this work, we have studied the effects of the compact TiO2 (c-TiO2) and mesoscopic TiO2 (mp-TiO2) layers on the performance of the perovskite based solar cells (PSCs). It is found that the increased interfacial area between the mesoscopic electron transport layer (ETL) and perovskite can enhance the device efficiency, particularly for the fill factor. We have then synthesized TiO2 nanorods (TiO2-NR) and incorporated it into PSCs, in which the interfacial area between perovskite and TiO2-NA is further increased. A hysteresis-free PSC with the power conversion efficiency (PCE) of 19 % can be obtained by using TiO2-NR as the ETL. The results of femtosecond transient absorption (fs-TA) clearly show that the carrier extraction efficiency is significantly enhanced due to substantial increase of the interfacial area between the perovskite and ETL nanostructures, resulting in a reduction in carrier diffusion distance.
KW - compact TiO
KW - electron transport layer
KW - mesoscopic TiO
KW - perovskite solar cells
KW - TiO nanorods
UR - http://www.scopus.com/inward/record.url?scp=85056345283&partnerID=8YFLogxK
U2 - 10.1109/EDSSC.2018.8487116
DO - 10.1109/EDSSC.2018.8487116
M3 - Conference article published in proceeding or book
AN - SCOPUS:85056345283
T3 - 2018 IEEE International Conference on Electron Devices and Solid State Circuits, EDSSC 2018
BT - 2018 IEEE International Conference on Electron Devices and Solid State Circuits, EDSSC 2018
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 2018 IEEE International Conference on Electron Devices and Solid State Circuits, EDSSC 2018
Y2 - 6 June 2018 through 8 June 2018
ER -