Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 12, Issue 51, Pages 57124-57133Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c17877
Keywords
perovskites; quantum dots; cation exchange; solar cells; high short circuit current density; stability
Funding
- International Collaborative R&D program by KIAT [0000895]
- Korea Institute of Machinery and Materials (KIMM) [NK224C]
- Alchemist project - Ministry of Trade, Industry and Energy (MOTIE, Republic of Korea)
- Ministry of Trade, Industry & Energy (MOTIE), Republic of Korea [N0000895] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Council of Science & Technology (NST), Republic of Korea [NK224C] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Perovskite quantum dots (PQDs) have expanded the scalability of perovskite materials by their high crystallinity, band-gap tunability, and surface ligand-driven functionalities in the colloidal state across optoelectronics as well as photovoltaics. To improve PQD performance in applications, however, defect control has emerged as a major challenge given the increased PQD surface area. Herein, we have developed a heterostructured PQD solar cell by combining CsPbI3 and FAPbI(3) (FA, formamidinium) PQD layers to introduce a multinary PQD layer based on a solid-state A-site cation-exchange strategy. A heterostructure, including the solid-state diffusion-driven multinary PQD layer, creates an internally graded heterojunction for more efficient charge extraction. The best PQD cell achieves a power conversion efficiency (PCE) of 16.07% with negligible hysteresis. Furthermore, this architecture offers significantly enhanced stability with reduction of trap-assisted recombination as compared to cells of a monocompositional PQD layer. The unencapsulated device retains a 96% PCE after 1000 h in ambient storage.
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