13% efficiency hybrid organic/silicon-nanowire heterojunction solar cell via interface engineering.
Interface carrier recombination currently hinders the performance of hybrid organic-silicon heterojunction solar cells for high-efficiency low-cost photovoltaics. Here, we introduce an intermediate 1,1-bis[(di-4-tolylamino)phenyl]cyclohexane (TAPC) layer into hybrid heterojunction solar cells based on silicon nanowires (SiNWs) and conjugate polymer poly(3,4-ethylenedioxy-thiophene):poly(styrenesulfonate) (PEDOT:PSS). The highest power conversion efficiency reaches a record 13.01%, which is largely ascribed to the modified organic surface morphology and suppressed saturation current that boost the open-circuit voltage and fill factor. We show that the insertion of TAPC increases the minority carrier lifetime because of an energy offset at the heterojunction interface. Furthermore, X-ray photoemission spectroscopy reveals that TAPC can effectively block the strong oxidation reaction occurring between PEDOT:PSS and silicon, which improves the device characteristics and assurances for reliability. These learnings point toward future directions for versatile interface engineering techniques for the attainment of highly efficient hybrid photovoltaics.
Department of Photonics and Institute of Electro-Optical Engineering, National Chiao-Tung University , Hsinchu 30010, Taiwan.
Peichen
P
Yu
Chia-Ying
CY
Tsai
Jan-Kai
JK
Chang
Chih-Chung
CC
Lai
Po-Han
PH
Chen
Yi-Chun
YC
Lai
Pei-Ting
PT
Tsai
Ming-Chin
MC
Li
Huai-Te
HT
Pan
Yang-Yue
YY
Huang
Chih-I
CI
Wu
Yu-Lun
YL
Chueh
Shih-Wei
SW
Chen
Chen-Hsun
CH
Du
Sheng-Fu
SF
Horng
Hsin-Fei
HF
Meng