STARS · STable perovskite solar cells via interfacial engineering of 2D/3D mixed-dimensional Absorbers and Robust dopant-free hole transporting materialS

STable perovskite solar cells via interfacial engineering of 2D/3D mixed-dimensional Absorbers and Robust dopant-free hole transporting materialS

Metal halide perovskites (MAPbI3 or FAPbI3 where MA= methylammonium, FA= formamidinium) have emerged as wonder materials for optoelectronic devices. In particular, the progress in photovoltaic (PV) devices based on these hybrid perovskite materials has been unprecedented. This rapid progress acquires great importance in the view of the commitment of the EU to move towards a low-carbon society by 2050. Solar energy harvesting is considered the leading solution in the renewable energy sector since it is low-cost, effective, sustainable, and green. Hybrid perovskite PV is a promising solar cell technology with power conversion efficiency (PCE) emerging from 3.8% in its first study to a current, certified value of 25.5% in single-junction perovskite solar cells (PSCs). In light of low manufacturing costs and appealing device performance, the levelized cost of electricity (LCOE) of perovskite PVs has the potential to reach impressively low levels to drive the global energy transition economically. However, despite the promises, the commercialization of PSCs is impeded by the low device stability. The poor device stability primarily stems from the intrinsic material chemistry, which leads to the formation of defects and mobile ions. Such mobile ions can diffuse into the interfaces, causing catastrophic failure. Furthermore, the hole transporting material employed for high-efficiency PSCs requires doping with ionic additives that are hydrophilic, and they lower the glass transition temperature, thus compromising the moisture and thermal stability, respectively. The objective of this project (STARS) was to tackle these stability issues by developing new robust perovskite absorbers combined with more stable, dopant-free hole-transporting materials (HTM). Apart from the scientific objectives, fostering the development of the fellow is also one of the project's key objectives. This project aligns with EU goals to replace traditional fossil fuels with renewable energy sources, significantly reducing the global carbon footprint and curbing anthropogenic CO2 emissions. Overall, this project is vital since it focuses on research on materials for a sustainable future to benefit society by improving human life quality, generating fundamental knowledge, and yielding robust technologies. The STARS project has succeeded in developing strategies for the bulk and interface engineering along with the development of HTMs, which has led to highly efficient (>24 %) and stable PSCs with T80 > 6000 h (time at which device loss 80% of the initial performance). The project has also succeeded in the career development of the fellow.

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