Highly efficient bifacial semitransparent perovskite solar cells based on molecular doping of CuSCN hole transport layer

Hou Shixin^{1, 2, 3, 4, 5}, Shi Biao^{1, 2, 3, 4, 5}, Wang Pengyang^{1, 2, 3, 4, 5, †}, Li Yucheng^{1, 2, 3, 4, 5}, Zhang Jie^{1, 2, 3, 4, 5}, Chen Peirun^{1, 2, 3, 4, 5}, Chen Bingbing^{1, 2, 3, 4, 5}, Hou Fuhua^{1, 2, 3, 4, 5}, Huang Qian^{1, 2, 3, 4, 5}, Ding Yi^{1, 2, 3, 4, 5}, Li Yuelong^{1, 2, 3, 4, 5}, Zhang Dekun^{1, 2, 3, 4, 5}, Xu Shengzhi^{1, 2, 3, 4, 5}, Zhao Ying^{1, 2, 3, 4, 5}, Zhang Xiaodan^{1, 2, 3, 4, 5, ‡}

(a) Transmittance spectra of a bare ITO/glass substrate, ITO-glass/undoped CuSCN substrate, and ITO-glass/doped CuSCN substrate, respectively; (b) ST-PSCs with two illumination directions. (c)–(f) J–V measurements and EQE spectra of the ST-PSCs with illumination incident from ITO/glass and transparent electrode side, respectively. The integrated J_sc for both sides are given in the legend.