미래를 창조하는 포스텍 화학공학과
We report flexible planar perovskite solar cells with robust electron-transport layers (ETLs) processed at low
temperature. A poly(allylamine) (PAA; 0.08 wt%) solution was deposited on a C60 layer and heated at 150 °C for
60 s, resulting in the formation of an insoluble robust C60–PAA electron-transport layer (ETL) on the flexible
substrate. The flexible planar perovskite solar cell with the C60–PAA ETL exhibited excellent properties with 83%
efficiency retention (η=15.2% without hysteresis) after 600 cycles of bending. This performance is superior to
that of the flexible device with a C60 ETL fabricated without the use of PAA (65% efficiency retention; η=9.8%
with some hysteresis).