Effect of organic molecule layer on the interfacial engineering, stability, and conversion efficiency of the perovskite solar cell heterostructure

Stability in the perovskite solar cells (PSCs) is a major concern nowadays, and interfacial engineering is the key to achieving this most important issue. As per the interfacial engineering, the organic molecules may play a vital role in PSCs as we incorporate these as interfacial layers, mainly in between perovskite absorber-hole transport material. The latest reports confirm the usefulness of the organic–inorganic mixed halides perovskites-based PSCs over the purely inorganic or other PSCs with the organic hole transport layers such as spiro-OMeTAD. The focus of this featured letter is to discuss the approaches for designing greatly precise organic molecules with functionalities tailored to the preferred application. Additionally, the efforts are dedicated to focusing on the importance of evolving new molecules to advance stability as well as the high photovoltaic output issues, including the commercialization issues, new opportunities, and future directions. These properties can be principally interesting for the interface engineering of PSCs.