TY - JOUR
T1 - π-Conjugated zwitterion for dual-interfacial modification in high-performance perovskite solar cells
AU - Hu, Zhao
AU - Yang, Biao
AU - Miao, Jingsheng
AU - Li, Tingting
AU - Umair Ali, Muhammad
AU - Yan, Chaoyi
AU - Goto, Osamu
AU - Shen, Clifton
AU - Xu, Baomin
AU - Meng, Hong
AU - Yan, Feng
N1 - Funding Information:
This work was financially supported by the Hong Kong Scholars Program (Grant No. XJ2018001), the Research Grants Council (RGC) of Hong Kong, China (Project Nos. PolyU 152087/17E), National Natural Science Foundation of China (51903005), Key-Area Research and Development Program of Guangdong Province(2019B010924003), Shenzhen Hong Kong Innovation Circle Joint R&D Project (SGDX20190918105201704), Shenzhen Science and Technology Research Grant(JCYJ20170412150946440), China (Shenzhen)-American Technology Collaboration Project (GJHZ20180928163206500) and special funding for the innovative R&D team of Dongguan (no. 2018607202005).
Publisher Copyright:
© 2021 Elsevier B.V.
PY - 2021/7/15
Y1 - 2021/7/15
N2 - Interfacial modification of perovskite solar cells (PSCs) with solution-processed zwitterionic materials is an attractive approach to improving device efficiency and stability. However, zwitterionic molecules for multifunctional modification in PSCs have been rarely reported. In this work, a zwitterionic unit is introduced as an acceptor group in a new n-type π-conjugated zwitterion, IT-IN. This newly developed interfacial material can not only act as a high-quality electron transport layers (ETLs) but also enable effective defect passivation of a perovskite film, to reduce the trap densities inside it. By incorporating IT-IN between Ag cathode and PC61BM to constitute a bilayer ETLs, a significant improvement in power conversion efficiency (PCE) of inverted PSCs from 16.68% to 19.60% is achieved. Furthermore, after introducing IT-IN into perovskite films as passivation agent, the PCE of the PSCs is further enhanced to 21.24%. In addition, our fabricated PSCs exhibit excellent stability in air because of the dual-interfacial modification. This work provides new insights on the design and application of multifunctional interface material for efficient and low-cost PSCs.
AB - Interfacial modification of perovskite solar cells (PSCs) with solution-processed zwitterionic materials is an attractive approach to improving device efficiency and stability. However, zwitterionic molecules for multifunctional modification in PSCs have been rarely reported. In this work, a zwitterionic unit is introduced as an acceptor group in a new n-type π-conjugated zwitterion, IT-IN. This newly developed interfacial material can not only act as a high-quality electron transport layers (ETLs) but also enable effective defect passivation of a perovskite film, to reduce the trap densities inside it. By incorporating IT-IN between Ag cathode and PC61BM to constitute a bilayer ETLs, a significant improvement in power conversion efficiency (PCE) of inverted PSCs from 16.68% to 19.60% is achieved. Furthermore, after introducing IT-IN into perovskite films as passivation agent, the PCE of the PSCs is further enhanced to 21.24%. In addition, our fabricated PSCs exhibit excellent stability in air because of the dual-interfacial modification. This work provides new insights on the design and application of multifunctional interface material for efficient and low-cost PSCs.
KW - Interfacial modification
KW - Passivation
KW - Perovskite solar cells
KW - Zwitterion
UR - http://www.scopus.com/inward/record.url?scp=85101713631&partnerID=8YFLogxK
U2 - 10.1016/j.cej.2021.129153
DO - 10.1016/j.cej.2021.129153
M3 - Journal article
AN - SCOPUS:85101713631
SN - 1385-8947
VL - 416
JO - Chemical Engineering Journal
JF - Chemical Engineering Journal
M1 - 129153
ER -