Fig. 5: NIR-tailored design for bottom cells.
From: Enhanced optical path and electron diffusion length enable high-efficiency perovskite tandems
a Molecular structure and absorbance spectrum of NFA. The symbol line denotes the absorbance of CQD. b Cross-sectional SEM image of fully solution-processed CQD bottom cell. Scale bar: 500 nm. c EQE spectra of CQD device without and with the organic layer. d Transmission (dashed) and absorption (solid) of In2O3:H and standard ITO films. e Reflection and f EQE spectra of reference and NIR-optimized SHJ cell. Short dashed lines indicate the bandedge cut-off of perovskite front cell.
