TY - JOUR
T1 - N-type conjugated polymer as efficient electron transport layer for planar inverted perovskite solar cells with power conversion efficiency of 20.86%
AU - Chen, Wei
AU - Shi, Yongqiang
AU - Wang, Yang
AU - Feng, Xiyuan
AU - Djurišić, Aleksandra B.
AU - Woo, Han Young
AU - Guo, Xugang
AU - He, Zhubing
N1 - Funding Information:
This work is supported by the National Natural Science Foundation of China (No. 61775091 and 51573076), the Shenzhen Key Laboratory Project (No. ZDSYS201602261933302) and Natural Science Foundation of Shenzhen Innovation Committee (Nos. JCYJ20180504165851864, JCYJ20170818141216288, JCYJ20180504165709042). The authors are grateful for support from the Seed Funding for Strategic Interdisciplinary Research Scheme of the University of Hong Kong and RGC GRF grants 15204515 and 15246816 are also acknowledged. The authors thank the Materials Characterization and Preparation Center (MCPC) and the Pico Center of SUSTech for some characterizations in this work.
Funding Information:
This work is supported by the National Natural Science Foundation of China (No. 61775091 and 51573076 ), the Shenzhen Key Laboratory Project (No. ZDSYS201602261933302 ) and Natural Science Foundation of Shenzhen Innovation Committee (Nos. JCYJ20180504165851864 , JCYJ20170818141216288 , JCYJ20180504165709042 ). The authors are grateful for support from the Seed Funding for Strategic Interdisciplinary Research Scheme of the University of Hong Kong and RGC GRF grants 15204515 and 15246816 are also acknowledged. The authors thank the Materials Characterization and Preparation Center (MCPC) and the Pico Center of SUSTech for some characterizations in this work. Appendix A
PY - 2020/2
Y1 - 2020/2
N2 - Fullerene and its derivatives are commonly used as electron transport layers (ETLs) in inverted perovskite solar cells (PSCs), since they show suitable band alignment and good electron mobility. However, fullerene-based ETLs typically result in low open-circuit voltages due to the interfacial defects, and they also exhibit poor photochemical and thermal stability. Consequently, there is great interest in the development of novel ETLs for high-performance inverted PSCs. In this work, two n-type polymers PBTI and PDTzTI are utilized as ETL in inverted PSCs, which are based on bithiophene imide and thienylthiazole imide, respectively. Due to its high electron mobility, well matched energy level alignment together with the passivation of interfacial traps/defects, device with the PDTzTI ETL demonstrates a best power conversion efficiency of 20.86%, which outperform those with PBTI and PCBM ETLs. Owning to the highly hydrophobic properties as well as the mobile ion blocking capability of polymer, PDTzTI ETL based device also exhibits excellent long-term and operational device stability as compared with the PCBM one. Our results demonstrate that rational selection of ETLs has great impact on the device efficiency and stability in inverted planar PSCs and that novel n-type polymer might be ideal alternative ETL in inverted planar PSCs.
AB - Fullerene and its derivatives are commonly used as electron transport layers (ETLs) in inverted perovskite solar cells (PSCs), since they show suitable band alignment and good electron mobility. However, fullerene-based ETLs typically result in low open-circuit voltages due to the interfacial defects, and they also exhibit poor photochemical and thermal stability. Consequently, there is great interest in the development of novel ETLs for high-performance inverted PSCs. In this work, two n-type polymers PBTI and PDTzTI are utilized as ETL in inverted PSCs, which are based on bithiophene imide and thienylthiazole imide, respectively. Due to its high electron mobility, well matched energy level alignment together with the passivation of interfacial traps/defects, device with the PDTzTI ETL demonstrates a best power conversion efficiency of 20.86%, which outperform those with PBTI and PCBM ETLs. Owning to the highly hydrophobic properties as well as the mobile ion blocking capability of polymer, PDTzTI ETL based device also exhibits excellent long-term and operational device stability as compared with the PCBM one. Our results demonstrate that rational selection of ETLs has great impact on the device efficiency and stability in inverted planar PSCs and that novel n-type polymer might be ideal alternative ETL in inverted planar PSCs.
KW - Electron transport materials
KW - Inverted perovskite solar cell
KW - Long-term stability
KW - N-type conjugated polymer
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U2 - 10.1016/j.nanoen.2019.104363
DO - 10.1016/j.nanoen.2019.104363
M3 - Article
AN - SCOPUS:85075965274
VL - 68
JO - Nano Energy
JF - Nano Energy
SN - 2211-2855
M1 - 104363
ER -
