27-11-2019 Programs_Abstracts
https://www.mrs.org/technical-programs/programs_abstracts/2019_mrs_spring_meeting/es16/es16_01_266/es16_01_06_301 1/2
E ectively Transparent
Superstrates for
Perovskite Solar Cells
Apr 22, 2019 - 10:00 AM - ES16.01.06
PCC North, 100 Level, Room 125 AB
Michael Kelzenberg1,Sisir Yalamanchili1,Kelly McKenzie1,Gabriel Woolls1,Maria Kowalchuk1,Qin Yang1,Nina Vaidya1,Pilar Espinet Gonzalez1,Jianghui Zheng2,Jincheol Kim2,Shujuan Huang2,Anita Ho-Baillie2,Rebecca Saive3,Harry Atwater1
California Institue of Technology1,University of New South Wales2,University of Twente3
We are developing e ectively transparent superstrates for perovskite solar cells. These superstrates incorporate triangular-shaped grid
ngers with thin transparent conductors, which mitigate shading losses associated with
conventional grid ngers and/or thick TCO layers. We have investigated various types of polymers for use as superstrates in both rigid (glass-backed) and
exible applications. We have developed an electroplating process to fabricate the triangular gridlines, which improves their conductivity vs. prior silver ink printing approaches. We will present a summary of perovskite solar cells that were
fabricated on these e ectively transparent superstrates, including a discussion of their
photovoltaic e ciency, spectral response, and LBIC mapping. The results demonstrate that e ectively transparent superstrates enable an improvement in the short-circuit current density and ll factor for large-area perovskite solar cells.<br/>Perovskite solar cells are of great interest due to their
potential for low cost and high performance. One of the challenges to attaining high photovoltaic
conversion e ciency, particularly for large-area cells, is the tradeo between the optical and
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27-11-2019 Programs_Abstracts
https://www.mrs.org/technical-programs/programs_abstracts/2019_mrs_spring_meeting/es16/es16_01_266/es16_01_06_301 2/2
electrical performance of the top contact. Because perovskite absorbers and selective electrode materials provide very little lateral conductivity for current collection, a transparent conductive oxide (TCO) such as indium tin oxide (ITO) must be used for the front contact. However, TCOs o er a tradeo between transparency and conductivity, resulting in a compromise between short-circuit current density (due to optical losses) and ll factor (due to resistive losses) for solar cells. A solution is to increase the density of the grid ngers such that thinner TCOs can be used; however, this increases the shading losses.<br/>Recently, a method to produce e ectively transparent front contact grids has been described (Adv. Optical Mater. 4 (10), 1470-1474 (2016); Photovoltaic Specialists
Conference (PVSC) IEEE 43rd, 3612-3615, (2016); Sustainable Energy and Fuels, 1 (3), 593-598, (2017)). This approach yields a relatively dense array of high-aspect-ratio, triangular-shaped front contact ngers, in which light striking the metal is re ected towards the cell. Our current work pertains to the application of this technology to perovskite solar cells.
