%0 Journal Article %1 qing2018aligned %A Qing, Jian %A Liu, Xiao‐Ke %A Li, Mingjie %A Liu, Feng %A Yuan, Zhongcheng %A Tiukalova, Elizaveta %A Yan, Zhibo %A Duchamp, Martial %A Chen, Shi %A Wang, Yuming %A Bai, Sai %A Liu, Jun‐Ming %A Snaith, Henry J. %A Lee, Chun‐Sing %A Sum, Tze Chien %A Gao, Feng %D 2018 %I Wiley Online Library %J Advanced Energy Materials %K 2D_material additive charge_separation perovskite stability %R 10.1002/aenm.201800185 %T Aligned and Graded Type‐II Ruddlesden–Popper Perovskite Films for Efficient Solar Cells %U https://doi.org/10.1002/aenm.201800185 %X Recently, Ruddlesden–Popper perovskites (RPPs) have attracted increasing interests due to their promising stability. However, the efficiency of solar cells based on RPPs is much lower than that based on 3D perovskites, mainly attributed to their poor charge transport. Herein, a simple yet universal method for controlling the quality of RPP films by a synergistic effect of two additives in the precursor solution is presented. RPP films achieved by this method show (a) high quality with uniform morphology, enhanced crystallinity, and reduced density of sub‐bandgap states, (b) vertically oriented perovskite frameworks that facilitate efficient charge transport, and (c) type‐II band alignment that favors self‐driven charge separation. Consequently, a hysteresis‐free RPP solar cell with a power conversion efficiency exceeding 12%, which is much higher than that of the control device (1.5%), is achieved. The findings will spur new developments in the fabrication of high‐quality, aligned, and graded RPP films essential for realizing efficient and stable perovskite solar cells. A simple and universal method involving the use of two synergistic additives (dimethylsulfoxide and methylammonium chloride) into precursor solution is reported for growing high‐quality Ruddlesden–Popper perovskite films. Based on this method, hysteresis‐free solar cells with power conversion efficiencies over 12% and excellent reproducibility are achieved.

@article{qing2018aligned, abstract = {Recently, Ruddlesden–Popper perovskites (RPPs) have attracted increasing interests due to their promising stability. However, the efficiency of solar cells based on RPPs is much lower than that based on 3D perovskites, mainly attributed to their poor charge transport. Herein, a simple yet universal method for controlling the quality of RPP films by a synergistic effect of two additives in the precursor solution is presented. RPP films achieved by this method show (a) high quality with uniform morphology, enhanced crystallinity, and reduced density of sub‐bandgap states, (b) vertically oriented perovskite frameworks that facilitate efficient charge transport, and (c) type‐II band alignment that favors self‐driven charge separation. Consequently, a hysteresis‐free RPP solar cell with a power conversion efficiency exceeding 12%, which is much higher than that of the control device (1.5%), is achieved. The findings will spur new developments in the fabrication of high‐quality, aligned, and graded RPP films essential for realizing efficient and stable perovskite solar cells. A simple and universal method involving the use of two synergistic additives (dimethylsulfoxide and methylammonium chloride) into precursor solution is reported for growing high‐quality Ruddlesden–Popper perovskite films. Based on this method, hysteresis‐free solar cells with power conversion efficiencies over 12% and excellent reproducibility are achieved.}, added-at = {2018-07-06T11:21:10.000+0200}, author = {Qing, Jian and Liu, Xiao‐Ke and Li, Mingjie and Liu, Feng and Yuan, Zhongcheng and Tiukalova, Elizaveta and Yan, Zhibo and Duchamp, Martial and Chen, Shi and Wang, Yuming and Bai, Sai and Liu, Jun‐Ming and Snaith, Henry J. and Lee, Chun‐Sing and Sum, Tze Chien and Gao, Feng}, biburl = {https://www.bibsonomy.org/bibtex/2164d60a54667281c9d32d511a71a5cd0/bretschneider_m}, doi = {10.1002/aenm.201800185}, interhash = {1a3b858aa225bfae187e967a76ad8e90}, intrahash = {164d60a54667281c9d32d511a71a5cd0}, issn = {1614-6832}, journal = {Advanced Energy Materials}, keywords = {2D_material additive charge_separation perovskite stability}, month = {1}, publisher = {Wiley Online Library}, timestamp = {2018-07-06T11:21:10.000+0200}, title = {Aligned and Graded Type‐II Ruddlesden–Popper Perovskite Films for Efficient Solar Cells}, url = {https://doi.org/10.1002/aenm.201800185}, year = 2018 }