Cost effective thiophene assisted novel dopant-free hole transport materials for efficient perovskite solar cell performance

Hole transport materials (HTMs) assisted halide perovskite solar cells (PSCs) revealed excellent performance in photovoltaic technology within a short time period. Herein, a cost-effective hole transport materials (HTMs) namely BTBDT and BTDTP are successfully synthesized using thiophene, engineered into perovskite devices, are witnessed in higher photovoltaic performance compared to commercially available Spiro-OMeTAD. PSCs with BTBDT and BTDTP HTMs, proven power conversion efficiency (PCE) of 16.96 % and 17.60 %. With an exact condition, test devices made by use of Spiro-OMeTAD evidenced 13.16 % PCE. Champion short-circuit density of 25.73 mA/cm2 is achieved in the present study for BTDTP assisted PSC. Devices stability performance is examined even after 60 days, which demonstrated PCE of 16.08 % for BTDTP, is highly stable than Spiro-OMeTAD devices (5.89 %). Apart from the unique device performance, the significant features like synthetic process is very simple, dopant free condition and cost effectiveness make BTBDT and BTDTP as plausible stand-ins to the Spiro-OMeTAD for utilizing as the hole transport material in PSCs.