Abstract
A bathocuproine (BCP) layer is typically used as the hole-blocking layer in p-i-n-structure perovskite solar cells (PSCs) between PC61BM and Ag electrodes. Before evaporating the Ag, we used a low-temperature (<40 °C) atmospheric-pressure dielectric barrier discharge jet (DBDjet) to treat the BCP with different scan rates. The main purpose of this was to change the contact resistance between the BCP layer and the Ag electrodes through surface modification using a DBDjet. The best power conversion efficiency (PCE) of 13.11% was achieved at a DBDjet scan rate of 2 cm/s. The He DBDjet treatment introduced nitrogen to form C−N bonds and create pits on the BCP layer. This deteriorated the interface between the BCP and the follow-up deposited-Ag top electrode. Compared to the device without the plasma treatment on the BCP layer, the He DBDjet treatment on the BCP layer reduced photocurrent hysteresis but deteriorated the fill factor and the efficiency of the PSCs.
Highlights
In the past few years, organic-inorganic hybrid perovskite solar cells (PSCs) have gained attention due to their high power conversion efficiency (PCE) and low cost [1,2,3,4,5,6,7,8,9]
After the He dielectric barrier discharge jet (DBDjet) treatment on the BCP layer at a lower scan rate, some pits could be clearly seen on the BCP layer
This study investigated the influence of He DBDjet plasma treatment on a BCP layer
Summary
In the past few years, organic-inorganic hybrid perovskite solar cells (PSCs) have gained attention due to their high power conversion efficiency (PCE) and low cost [1,2,3,4,5,6,7,8,9]. We used a portable surface-diffusion DBD device to treat the perovskite layer for both p-i-n and n-i-p PSCs. With the use of a proper processing time, the efficiency of PSCs can be improved [39,40]. The same DBDjet was used for stripping the polyvinylpyrrolidone outside the jet-sprayed Ag nanowire electrodes of fully solution-processed n-i-p structure PSCs to improve the device performance [44]. Most recently, this DBDjet was used to treat low-temperature TiO2 nanoparticle ETLs of PSCs on a polyethylene naphthalate substrate [45]. We investigated the performance of PSCs in which the BCP layer was treated using the He DBDjet before the Ag electrode deposition
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