Device design of efficient HTL-free all carbon-based perovskite solar cell

Abstract

Abstract Perovskite solar cells (PSCs) are a very promising photovoltaic technology, however, the cost issue of their precious metal back electrodes needs to be addressed. Carbon-electrode-based perovskite solar cells (C-PSCs) have attracted considerable attention for their superior stability, high economic efficiency, and eco-friendliness. However, compared to other types of PSCs, there is still significant potential for improving the power conversion efficiency (PCE) of C-PSCs. Moreover, if the transparent front electrode and transport layer can also be replaced by stable carbon materials to form the all-carbon-based PSCs (AC-PSCs), it will further promote their practical applications. This work proposes four types of C-PSCs (including two AC-PSCs) and conducts simulation with the SCAPS-1D program. For the four structures, the device with FASnI3 absorber layer always has better performance, and the structure of graphene/C60/FASnI3/carbon (Cell 4) attained the highest PCE of 31.62%. The optimal parameters for each layer are also determined through the simulation work. This work will promote the development of all-carbon-based perovskite solar cells.