High-performance inverted ternary organic solar cells using solution-processed tin oxide as the electron transport layer

In this study, we investigated the fabrication of high-performance inverted ternary organic solar cells (OSCs) using solution-processed SnO2 as the electron transport layer. Compared with standard structured OSCs using poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) and LiF, the inverted PM6:PC71BM:Y6-based ternary OSCs showed enhanced charge transport and suppressed charge recombination properties, which are beneficial for improving the solar performance. As a result, an average power-conversion-efficiency (PCE) of 16.3% was achieved for the inverted OSCs using SnO2, which is higher than that (15.2%) of standard devices. Moreover, the inverted OSCs showed a simultaneously improved long-term stability with the PCE degradation significantly suppressed from 46.1% to 23.9% after a 15-days measurement in ambient condition. The best inverted OSC exhibited a highest PCE of 16.7% with a stable power output and negligible hysteresis. Our results demonstrate the superior effect of inverted strategy on boosting the performance of ternary OSCs.