Publication date: 31st May 2020
Solution-processed organic (OSCs) and perovskite solar cells (PSCs) have attracted tremendous attention because of their advantages such as low cost, lightweight, mechanical flexibility and easy manufacturing process for semi-transparent devices. The last decade featured a rapid increase in the efficiency of OSCs and PSCs up to 18% and 25%, respectively. This evolution is attributed to the development of new materials with advanced properties [1].
Nevertheless, some drawbacks of state-of-the-art OSCs and PSCs impeded their massive production and application. The large-area OSCs demonstrate still low efficiencies due non-optimal morphology of active layer films [2]. This problem could be overcome using crystalline materials displaying ordered packing in solid state, particularly thiazole-containing polymers. It is known that thiazolothiazole fused rings can increase the rigidity of the molecules and enhance the self-ordering of polymer in films [3]. The crystalline polymers are also promising charge-transport materials for PSCs that improve the efficiency and stability of the devices. It is known that the polymer films might prevent evaporation of volatile decomposition products from perovskite films, thus increasing the stability of PSCs.
In this work, we report the synthesis of novel thiazolothiazole-based conjugated polymer P1 comprising DADAD system of thiophene (D) and benzothiadiazole (A) alternating blocks. Preliminary investigation of photovoltaic properties of P1 in OSCs with fullerene derivative [60]PCBM as acceptor showed moderate PCEs of 6.2%. Moreover, polymer P1 was used as HTL for perovskite solar cells and provided high efficiency of 17.1%. Evaluation of the device operational stability study is currently in process.
This work was financially supported by the Russian Foundation for Basic Research, (project No. 18-33-20025)
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