Journal
ADVANCED MATERIALS
Volume 32, Issue 23, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201907396
Keywords
perovskite solar cells; self-assembly; stability; surface passivation; tribenzylphosphine oxide
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Funding
- National Natural Science Foundation of China [91733301, 51761145042, 11874402, 51421002, 51872321, 51627803]
- Ministry of Science and Technology of the People's Republic of China [2018YFB1500101]
- International Partnership Program of Chinese Academy of Sciences [112111KYSB20170089]
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Surface passivation is an effective approach to eliminate defects and thus to achieve efficient perovskite solar cells, while the stability of the passivation effect is a new concern for device stability engineering. Herein, tribenzylphosphine oxide (TBPO) is introduced to stably passivate the perovskite surface. A high efficiency exceeding 22%, with steady-state efficiency of 21.6%, is achieved, which is among the highest performances for TiO2 planar cells, and the hysteresis is significantly suppressed. Further density functional theory (DFT) calculation reveals that the surface molecule superstructure induced by TBPO intermolecular pi-pi conjugation, such as the periodic interconnected structure, results in a high stability of TBPO-perovskite coordination and passivation. The passivated cell exhibits significantly improved stability, with sustaining 92% of initial efficiency after 250 h maximum-power-point tracking. Therefore, the construction of a stabilized surface passivation in this work represents great progress in the stability engineering of perovskite solar cells.
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