Journal
ENERGY & ENVIRONMENTAL SCIENCE
Volume 12, Issue 10, Pages 3074-3088Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9ee02043h
Keywords
-
Funding
- Swiss National Science Foundation (SNF) [NRP70, PV2050, 407040_153976, 407040_153916]
- Sinergia Episode [CRSII5_171000]
- SNF-NanoTera
- Bridge Power [176552]
- Swiss Federal Office of Energy [SYNERGY: 20NA21_150950]
- Competence Center for Energy andMobility
- Swiss National Science Foundation [CR23I2-162828]
- Swiss National Science Foundation (SNF) [407040_153976, 407040_153916, CR23I2_162828] Funding Source: Swiss National Science Foundation (SNF)
Ask authors/readers for more resources
Over the last years, the operational stability of perovskite solar cells has been significantly improved by compositional engineering, interface modification, and improved encapsulation techniques. However, irreversible degradation is still ubiquitously observed during the first 1000 hours of operation, particularly at elevated temperatures. In this work, we elucidate a major mechanism controlling this degradation. For that, formamidinium lead iodide-based perovskite solar cells were stressed under continuous 1 sun illumination at 80 degrees C in N-2, before extensive characterization of their microstructure and composition. The cell active area and hence the photocurrent are found to decrease with time due to the growth of porous PbI2-rich regions. This degradation was observed to originate from a few seed points in the perovskite bulk rather than from the interfaces with the charge-selective layers or from the cell edges. I-2 vapor, first released at these defective points and then further released from the decomposition of the perovskite exposed to this vapor, controls the degradation process. Furthermore, this autocatalytic degradation process is shown to locally rupture the top electrode due to vapor pressure build-up. In addition to highlighting the detrimental influence of residual PbI2, we show that such a degradation pathway can be alleviated by reducing the methylammonium and/or iodine content, providing a path to more stable perovskite solar cells.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available