Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 11, Issue 51, Pages 47868-47877Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b15320
Keywords
counter electrode; Bi2Te3; topological insulator; flexible perovskite solar cells; CH3NH3PbI3
Funding
- National Natural Science Foundation of China [11575065, 61571203]
- National Key R&D Program of China [2017YFB0406301]
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Inverted flexible perovskite solar cells (PSCs) typically employ expensive metals as the counter electrodes, which are brittle and corrodible by perovskite, leading to a sharp performance drop under continuous bending, air exposure, thermal stress, or light illumination and eventually retard the commercialization. Herein, a low-cost Bi2Te3 counter electrode was employed by using a simple thermal evaporation process. The resultant device achieved an excellent power conversion efficiency of 18.16%, which was among the highest reported efficiencies, much higher than the reference Ag PSC (15.90%). The improvement should be attributed to the intrinsic suppressed electron backscattering in a Bi2Te3 topological insulator. Simultaneously, the Bi2Te3 device obtained a significantly improved mechanical flexibility and long-term operational stability. The present strategy will help to open up a new avenue for future commercialization of flexible photovoltaic applications.
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