Organic-inorganic hybrid halide perovskites have rapidly become a focal point of the photovoltaic (PV) community as a promising next-generation PV technology. The certified efficiency of single-junction perovskite solar cell (PSC) has reached 25.5%. In addition to single-junction solar cell applications, perovskites are also uniquely suited for developing highly efficient dual-junction tandem solar cells. By tuning perovskite compositions, the optical bandgaps of perovskites can be adjusted over a wide range (e.g., 1.2 eV to 1.8 eV) with demonstrated high efficiency levels (e.g., &gt;20%). Thus, the perovskite absorbers have also enabled the development of various tandem devices, including perovskite/perovskite, perovskite/silicon, or perovskite coupled with other thin-film absorbers (e.g., CIGS). In this talk, I will first provide an overview of recent advances in low-bandgap (1.2–1.3 eV) and wide-bandgap (1.7–1.8 eV) perovskites and their applications in tandem solar cells. I will discuss our recent progress on suppressing defects in perovskites with a wide range of perovskite compositions. Specifically, strategies on utilizing 2D perovskite passivation agents (2D-PPAs) will be discussed. 2D perovskites are normally based on bulky organic cations (e.g., butylammonium or phenethylammonium), which are hydrophobic and can prevent device degradation associated with moisture intrusion. If processed correctly, modifying 3D perovskite with 2D-PPAs can enhance both device stability and efficiency. Tuning precursor chemistry and growth conditions with 2D-PPAs affect significantly the physical and optoelectronic properties of perovskites. I will also discuss our recent progress on incorporating perovskite absorbers in highly efficient tandem devices.

Advances in low- and wide-bandgap perovskites for efficient tandem solar cells

ACS Fall 2021

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.