Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)
Publication date: 1st March 2014
The recent five years have witnessed the rise of highly efficient organometal halide perovskite-based solar cells from the efficiency of 3.8% to 16.2%. In the conventional perovskite solar cells, compact ceramic film is always required as blocking layer on transparent conducting oxide (TCO) substrate for efficient electron-selective contact. In this work, surface engineering approach is demonstrated to avoid the deposition of ceramic compact film. Alkali metal salt solution was used to modify the TCO substrate surface to achieve the optimized interface energy level alignment, resulting in an efficient electron-selective contact. The scan kelvin probe microscopy (SKPM) results indicated that the surface work function of ITO was changed by 0.4 eV after treatment. Basing on the device structure of Modified ITO/CH3NH3PbI3/Spiro-OMeTAD/Au, a remarkable power conversion efficiency of 15.1% was achieved under AM1.5G 100 mWcm-2 irradiation without the use of compact blocking layer.
Moreover, the device stability basing on the modified ITO was also investigated. The results was encouraging after exposing the devices without encapsulation in the air over 300 hours (Humidity 20%, Temeprature 20 ºC ).
This study provides an unconventional example of efficient perovskite solar cell without the deposition of compact electron-selective layer. Furthermore, these results also reveal that interface optimization strategies in organic electronics could be effectively utilized to improve the performance of perovskite solar cells with the aim of achieving PCE exceeding 20%.
Figure 1 :(a) Schemetic of the device structure (b) Photovoltaic performance characterization. The best performance achieved for the perovskite solar cell fabricated on the modified ITO substrate. Insert: IPCE spectrum for the same device.
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