Heterojunction engineering for improving perovskite solar cell performance

In the wave of renewable energy replacing fossil energy, perovskite solar cells (PSCs) have emerged. In recent work by X. Sun et al., perovskite devices built by precisely controlling the thermal annealing process achieved a large open-circuit voltage (1.23 V) and power-conversion-efficiency up to 20.32%. This study sheds new light on junction engineering strategies to enhance the performance of PSCs. In the wave of renewable energy replacing fossil energy, perovskite solar cells (PSCs) have emerged. In recent work by X. Sun et al., perovskite devices built by precisely controlling the thermal annealing process achieved a large open-circuit voltage (1.23 V) and power-conversion-efficiency up to 20.32%. This study sheds new light on junction engineering strategies to enhance the performance of PSCs. Highly efficient CsPbI3/Cs1-xDMAxPbI3 bulk heterojunction perovskite solar cellSun et al.JouleMarch 3, 2022In BriefA stable CsPbI3/Cs1-xDMAxPbI3 bulk heterojunction (BHJ) PSC was fabricated via precisely controlling the thermal annealing process. The perovskite BHJ structure not only facilitates the charge separation and collection process by enhancing the built-in potential but also obviously reduces the carrier recombination loss. Therefore, the maximum open-circuit voltage (VOC) of 1.23 V was obtained as the VOC deficit was reduced to 0.45 V, and the champion power conversion efficiency (PCE) of the BHJ device reached 20.32% (certified PCE was 19.66%). Full-Text PDF