Chirality-Induced Crystallization and Defect Passivation of Perovskites: Toward High-Performance Solar Cells.
ACS Appl Mater Interfaces
; 16(13): 16340-16350, 2024 Apr 03.
Article
em En
| MEDLINE
| ID: mdl-38511525
ABSTRACT
As an additive for perovskites, in addition to functional groups, the steric configuration of molecules is worthy of consideration because it influences perovskite crystallization, thus determining whether defect passivation is effective without any side effects. In this work, the chiral molecules l- and d-pyroglutamic acid (l-PA and d-PA) were chosen as additives for perovskite passivators to reveal the reasons for the differences in passivation between amino acids with different steric configurations. Functional groups, such as the CâO groups and N-H groups of l-PA and d-PA, can passivate the perovskite defects. However, l-PA exhibited a more distorted steric configuration, while d-PA was more planar, leading to differences in the distances between the two CâO groups. Taking the Pb-Pb bond length as a reference, the shorter distance between the two CâO groups of l-PA distorts the perovskite lattice structure, which results in poor device stability. Conversely, the similar distance between the two CâO groups of d-PA promoted the preferred orientational growth of the perovskite. Finally, the d-PA-doped device accomplished an excellent efficiency of 24.11% with an improved open-circuit voltage of 1.17 V. Furthermore, the efficiency of the unencapsulated d-PA-doped device was maintained at 93% in N2 for more than 3000 h and 74% after 500 h of operation at maximum power point tracking under continuous illumination.
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01-internacional
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MEDLINE
Idioma:
En
Revista:
ACS Appl Mater Interfaces
Ano de publicação:
2024
Tipo de documento:
Article