期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 61, 期 11, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202117303
关键词
Defect Passivation; Energy Level Alignment; Perovskite Solar Cells; Thermal Stability; pi-Conjugated Ionic Compound
资金
- National Natural Science Foundation of China [21975116, 61874098]
- Major Program of Guangdong Basic and Applied Research [2019B030302009, 2019B121205001]
- National Research Foundation of Korea (NRF) - Korea government (MSIT) [2021R1A2C3004420]
- National Research Foundation of Korea [2021R1A2C3004420] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Defects and energy offsets at the interfaces of perovskite have a negative impact on the efficiency and stability of perovskite solar cells. In this study, an amphiphilic pi-conjugated ionic compound was designed to simultaneously address the defects and interface energy level misalignment. The modified perovskite solar cells showed improved efficiency and excellent thermal stability.
Defects and energy offsets at the bulk and heterojunction interfaces of perovskite are detrimental to the efficiency and stability of perovskite solar cells (PSCs). Herein, we designed an amphiphilic pi-conjugated ionic compound (QAPyBF(4)), implementing simultaneous defects passivation and interface energy level alignments. The p-type conjugated cations passivated the surface trap states and optimized energy alignment at the perovskite/hole transport layer. The highly electronegative [BF4](-) enriched at the SnO2 interface featured desired band alignment due to the dipole moment of this interlayer. The planar n-i-p PSC had an efficiency of 23.1 % with V-oc of 1.2 V. Notably, the synergy effect elevated the intrinsic endothermic decomposition temperature of the perovskite. The modified devices showed excellent long-term thermal (85 degrees C) and operational stability at the maximum power point for 1000 h at 45 degrees C under continuous one-sun illumination with no appreciable efficiency loss.
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