A joint team led by Tan Hairen from Nanjing University and Chang Chao from the National Innovation Institute of Defense Technology utilized terahertz technology to achieve precise and non-destructive detection of carrier transport behavior in all-perovskite tandem solar cells. The optimized cells achieved a power conversion efficiency exceeding 30%. The related research was published online in the authoritative international journal Nature on October 28.

Details:

The researchers identified the interface between the perovskite light-absorbing layer and the hole transport layer as a region with significant carrier loss. To address this, the team designed a dipole passivation layer that functions like a one-way street—connecting the perovskite layer to the hole transport layer and directing carrier movement toward the latter. Terahertz radiation detection clearly revealed the microscopic mechanism of the dipole passivation strategy in promoting charge transport and suppressing losses. Experimental data showed that passivated perovskite films exhibited over 68% improvement in total carrier mobility and nearly 30% extension in carrier diffusion length.

(Source: Xinhua News Agency)