Perovskite solar cells have attracted widespread attention due to their high energy conversion efficiency and simple manufacturing process. However, open circuit voltage (VOC ) losses remain a significant obstacle to improving device performance.
Pang Shuping, Cui Guanglei, Xiao Wang and others from the Qingdao Institute of Bioenergy and Processes, Chinese Academy of Sciences, demonstrated a simple strategy to increase VOCs to 95.5% of the Shockley-Queisser (SQ) limit by introducing a universal multifunctional polymer additive. . The additive effectively passivates both cationic and anionic defects, causing the perovskite film to transition from strong n-type to weak n-type.
Benefiting from energy level alignment and suppression of bulk nonradiative recombination, quasi-Fermi level splitting (QFLS) is enhanced. As a result, the champion device using 1.59 eV perovskite achieved the highest VOC value of 1.24 V and a power conversion efficiency (PCE) of 23.86%.
In addition, this strategy increased the VOC by at least 0.07 V in five different perovskite systems and achieved a PCE of 25.04% based on a PSC of 1.57 eV, and the corresponding module (14 cm2) also achieved a high PCE of 21.95% . This work provides an effective and general strategy to promote VOC methods to reach the detailed equilibrium theoretical limit.
D. Liu, C. Chen, X. Wang, X. Sun, B. Zhang, Q. Zhao, Z. Li, Z. Shao, X. Wang, G. Cui, S. Pang, Enhanced Quasi-Fermi Level Splitting of Perovskite Solar Cells by Universal Dual-Functional Polymer. Adv. Mater. 2023, 2310962.
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