Interfacial Mass Diagnostics: Quantitative Perspective on Construction and Mechanism Understanding of Dye‐Sensitized, Perovskite and Quantum Dots Solar Cells

Abstract Dye‐sensitized solar cells (DSSCs), quantum dot‐sensitized solar cells (QDSSCs) and perovskite solar cells (PSCs) have attracted wide attention. DSSCs, QDSSCs and PSCs can be prepared by liquid phase or solid phase, which causes a certain range of interface micro‐mass changes during preparation. In addition, the photoelectric conversion process occurring inside the device also inevitably causes interface micro‐mass changes. Interpretation of these interface micro‐mass changes can help to optimize the cell structure, improve the stability and performance repeatability of the device, as well as directly or indirectly infer, track and predict the internal photoelectric conversion mechanism of the device. Quartz crystal microbalance (QCM) is a powerful tool for studying surface mass changes, extending this technology to the fields of solar cells to directly obtain interface micro‐mass changes, which makes the research more in‐depth and opens up a new perspective for explaining the basic principles of solar cells. This review summarizes the research progress of QCM application in DSSCs, QDSSCs and PSCs in recent years, and explores the challenges and new opportunities of QCM application in new solar cells in the future.