Modulation of PEDOT:PSS pH for Efficient Inverted Perovskite Solar Cells with Reduced Potential Loss and Enhanced Stability
Year: 2016
Type: article
Abstract: Inverted p-i-n perovskite solar cells (PVSCs) using PEDOT:PSS as the hole-transporting layer (HTL) is one of the most widely adopted device structures thus far due to its facile processability and good compatibility for high throughput manufacturing processes. However, most of the PEDOT:PSS-based CH 3 NH 3 PbI 3 PVSCs reported to date suffered an inferior open-circuit voltage ( V OC ) (0.88–0.95 V) compared to that (1.05–1.12 V) obtained for common CH 3 NH 3 PbI 3 PVSCs, revealing a severe potential loss issue. Herein, we describe a simple method to alleviate this problem by tuning the pH value of PEDOT:PSS with a mild base, imidazole. Accompanied by the pH modulation, the blended imidazole concurrently tailors the surface texture and electronic properties of PEDOT:PSS to promote the quality and crystallization of the perovskite film deposited on top of it and enable better energy-level alignment at this corresponding interface. Consequently, the PVSC using this modified PEDOT:PSS HTL yields an enhanced power conversion efficiency (PCE) of 15.7% with an enlarged V OC of 1.06 V and improved long-term stability. These outperform the pristine device showing a PCE of 12.7% with a much smaller V OC of 0.88 V and unsatisfactory environmental stability.
Institutions: Shanghai Jiao Tong University, University of Washington
Language: English
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: green
Awards: G1021789829, G1233945259, RAPID DEVELOPMENT OF HYBRID PEROVSKITES AND NOVEL TANDEM ARCHITECTURES, G4641463002, An Integrated Approach Combining Compositional, Interfacial Material Engineering, and Characterization to Investigate the Complex Hysteresis Instability in Perovskite Solar Cells, G7696380052
OpenAlex ID: W2548967334