Proceedings of Online International Conference on Hybrid and Organic Photovoltaics (OnlineHOPV20)
Publication date: 22nd May 2020
Record efficiencies of perovskite solar cells (PSCs) have reached that of the conventional Si-based technologies, and therefore, in the nearest future, a transition from lab to fab is expected. At the current stage of the research, very often organic hole-transporting materials are considered to be the weakest link in terms of price and stability, leading to a high interest in the development of novel concepts for the formation of the selective contacts.
Recently, we have demonstrated, that carbazole-based phosphonic acids can serve as an efficient selective layer in p-i-n PSCs while adding the advantage of the simple processing of the layer [1]. In the following work, the structure of the materials was further simplified, to give final compounds 2PACz and MeO-2PACz. Devices based on these materials showed improved efficiency (over 20%), in comparison to the standard material PTAA (18.9%).
As this method yields a monolayer-thick film that is dopant-free, initial stability assessment showed superior performance under operational conditions. In addition, our method of the selective layer formation provides several advantages over traditional spin-coated films, namely: minimal material consumption; negligible parasitic absorption; possibility of the conformal coverage on rough substrates.
The latter was utilized in the CIGS/perovskite tandem device, where perovskite top cell needs to be formed on the uneven surface of the CIGS bottom cell. The limitation was overcome, and a world record-breaking efficiency of 24.2% was achieved. Moreover, these materials were further integrated into the monolithic two-terminal Si/perovskite tandem devices, to give efficiency of 29.2%.
In conclusion, due to the simplicity of the synthetical pathway, and flexibility of the layer formation techniques, we believe that further advances can be achieved upon optimization of the structure of the monolayer-based selective layers.
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