Abstract
Herein we report a 3,9-bis(2-methylene-(3-(1,1-dicyanomethylene)-indanone))-5,5,11,11-tetrakis(4-hexylphenyl)-dithieno[2,3-d:2′,3′-d′]-s-indaceno[1,2-b:5,6-b′] dithiophene (ITIC) small molecule additive based bulk heterojunction (BHJ) perovskite solar cell (PSC). The BHJ PSC with 0.2 wt% of ITIC exhibits a power conversion efficiency (PCE) of 17.6% with remarkably enhanced short-circuit current of 23.7 mA cm−2 as compared to reference PSC (without ITIC). The addition of ITIC plays an important role in improving the quality of the perovskite film like enhanced absorption, compact grains with reduced roughness (≈12.3 nm), higher electron mobility (μe = 1.43 × 10-3 cm2 V-1 s−1), better charge extraction and thermal stability of the solar cells. The BHJ PSC device degraded only by ≈18% after 53 days at 80 °C in atmospheric condition. In addition, several important characteristics of solar cell like current-voltage hysteresis, charge transfer, and recombination losses have been studied.
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