Modulation of PEDOT : PSS pH for efficient inverted perovskite solar cells with reduced potential loss and enhanced stability
Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review
Author(s)
Detail(s)
Original language | English |
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Pages (from-to) | 32068-32076 |
Journal / Publication | ACS Applied Materials and Interfaces |
Volume | 8 |
Issue number | 46 |
Publication status | Published - 23 Nov 2016 |
Externally published | Yes |
Link(s)
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 CH3NH3PbI3 PVSCs reported to date suffered an inferior open-circuit voltage (VOC) (0.88-0.95 V) compared to that (1.05-1.12 V) obtained for common CH3NH3PbI3 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 VOC of 1.06 V and improved long-term stability. These outperform the pristine device showing a PCE of 12.7% with a much smaller VOC of 0.88 V and unsatisfactory environmental stability.
Research Area(s)
- environmental stability, PEDOT:PSS, perovskite solar cells, pH, potential loss
Citation Format(s)
Modulation of PEDOT: PSS pH for efficient inverted perovskite solar cells with reduced potential loss and enhanced stability. / Wang, Qin; Chueh, Chu-Chen; Eslamian, Morteza et al.
In: ACS Applied Materials and Interfaces, Vol. 8, No. 46, 23.11.2016, p. 32068-32076.
In: ACS Applied Materials and Interfaces, Vol. 8, No. 46, 23.11.2016, p. 32068-32076.
Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review