Epitaxial 1D electron transport layers for high-performance perovskite solar cells.
We demonstrate high-performance perovskite solar cells with excellent electron transport properties using a one-dimensional (1D) electron transport layer (ETL). The 1D array-based ETL is comprised of 1D SnO2 nanowires (NWs) array grown on a F:SnO2 transparent conducting oxide substrate and rutile TiO2 nanoshells epitaxially grown on the surface of the 1D SnO2 NWs. The optimized devices show more than 95% internal quantum yield at 750 nm, and a power conversion efficiency (PCE) of 14.2%. The high quantum yield is attributed to dramatically enhanced electron transport in the epitaxial TiO2 layer, compared to that in conventional nanoparticle-based mesoporous TiO2 (mp-TiO2) layers. In addition, the open space in the 1D array-based ETL increases the prevalence of uniform TiO2/perovskite junctions, leading to reproducible device performance with a high fill factor. This work offers a method to achieve reproducible, high-efficiency perovskite solar cells with high-speed electron transport.
School of Advanced Materials Science & Engineering, Sungkyunkwan University, Suwon 440-746, Republic of Korea. hsjung1@skku.edu.
Gill Sang
GS
Han
Hyun Suk
HS
Chung
Dong Hoe
DH
Kim
Byeong Jo
BJ
Kim
Jin-Wook
JW
Lee
Nam-Gyu
NG
Park
In Sun
IS
Cho
Jung-Kun
JK
Lee
Sangwook
S
Lee
Hyun Suk
HS
Jung