Journal
ACS APPLIED ENERGY MATERIALS
Volume 3, Issue 8, Pages 7572-7579Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.0c01001
Keywords
perovskite solar cells; inorganic hole-transport layer; Cu2O nanoparticles; defect passivation; stability
Funding
- Korea Institute of Energy Technology Evaluation and Planning (KETEP) - Ministry of Trade, Industry, and Energy of the Republic of Korea [20183010014470]
- National Research Foundation of Korea (NRF) - Korean government (Ministry of Science and ICT) [2020R1A2C100545211]
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Interfacial degradation in perovskite solar cells is a critical issue affecting long-term stability for future commercialization. In particular, a perovskite and an organic hole-transport layer (HTL) react easily when the device is exposed to extreme operating conditions (heat, light, and air). To prevent degradation, an inorganic CuSCN HTL has emerged as an alternative, yet the interfacial reactivity is still not clearly elucidated. Herein, Cu2O and CuSCN are coutilized to form an efficient and stable HTL. While uniform film formation using Cu2O is difficult despite its high mobility, a Cu2O-CuSCN nanocomposite can be excellently synthesized as an effective HTL, exhibiting a power conversion efficiency (PCE) of 19.2% and sustaining its PCE over 90% for 720 h under extreme conditions (85 degrees C/85% of relative humidity, encapsulated). A chemical distribution analysis by secondary-ion mass spectroscopy (SIMS) suggests that a Cu2O nanoparticle layer protects the interface between the perovskite and CuSCN. The optoelectronic properties of the nanocomposite HTL and the improved solar cell performance are correlated with the recombination rate, electronic trap distribution in the band gap, and charge extraction efficiencies.
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