Promise of commercialization: Carbon materials for low-cost perovskite solar cells

Cai Yu^{1, 2}, Liang Lusheng², Gao Peng^{2, †}

(a) Schematics and (b) cross-sectional SEM image of the SWCNT-contacted device. The carbon nanotube “whiskers” in front of the SEM image are due to sample preparation. (c) Schematics and (d) cross-sectional SEM image of the standard Au contacted device with spin-coated spiro-OMeTAD HTM. Reprinted from Ref. [90].