%0 Journal Article %1 ADFM:ADFM201605469 %A Zhu, Hugh Lu %A Xiao, Junyan %A Mao, Jian %A Zhang, Hong %A Zhao, Yong %A Choy, Wallace C. H. %D 2017 %J Advanced Functional Materials %K perovskite %N 11 %P n/a--n/a %R 10.1002/adfm.201605469 %T Controllable Crystallization of CH3NH3Sn0.25Pb0.75I3 Perovskites for Hysteresis-Free Solar Cells with Efficiency Reaching 15.2% %U http://dx.doi.org/10.1002/adfm.201605469 %V 27 %X While SnPb alloyed perovskites have been considered as an effective approach to broaden the absorption spectrum, it is still challenging to modify the crystallization (and thus morphology, crystallinity, and orientation) in a controllable manner and thus boost the efficiency of SnPb alloyed perovskite solar cells. Here, it is unveiled that controlling the crystallization of CH3NH3Sn0.25Pb0.75I3 films can be simply realized by adjusting the amount of dimethyl sulfoxide in precursors, which has not been reported in SnPb alloyed perovskite systems. The remarkable perovskite crystallinity enhancement by the 20-fold enhanced (110) plane intensity in the X-ray diffraction spectrum of CH3NH3Sn0.25Pb0.75I3 and the preferred (110) orientation with the texture coefficient enhanced by 2.6 times to reach 0.88 are demonstrated. Importantly, it is discovered that the introduction of dimethyl sulfoxide avoids the formation of the colloidal coagulation observed in prolonged-storage precursors and ameliorates inhomogeneous Sn/Pb distributions in resultant perovskite films. Through optimizing perovskite films and device structures, hysteresis-free planar-heterojunction CH3NH3Sn0.25Pb0.75I3 solar cells with the efficiency reaching 15.2%, which are the most efficient SnPb alloy-based perovskite solar cells, are achieved.

@article{ADFM:ADFM201605469, abstract = {While SnPb alloyed perovskites have been considered as an effective approach to broaden the absorption spectrum, it is still challenging to modify the crystallization (and thus morphology, crystallinity, and orientation) in a controllable manner and thus boost the efficiency of SnPb alloyed perovskite solar cells. Here, it is unveiled that controlling the crystallization of CH3NH3Sn0.25Pb0.75I3 films can be simply realized by adjusting the amount of dimethyl sulfoxide in precursors, which has not been reported in SnPb alloyed perovskite systems. The remarkable perovskite crystallinity enhancement by the 20-fold enhanced (110) plane intensity in the X-ray diffraction spectrum of CH3NH3Sn0.25Pb0.75I3 and the preferred (110) orientation with the texture coefficient enhanced by 2.6 times to reach 0.88 are demonstrated. Importantly, it is discovered that the introduction of dimethyl sulfoxide avoids the formation of the colloidal coagulation observed in prolonged-storage precursors and ameliorates inhomogeneous Sn/Pb distributions in resultant perovskite films. Through optimizing perovskite films and device structures, hysteresis-free planar-heterojunction CH3NH3Sn0.25Pb0.75I3 solar cells with the efficiency reaching 15.2%, which are the most efficient SnPb alloy-based perovskite solar cells, are achieved.}, added-at = {2017-03-16T11:01:03.000+0100}, author = {Zhu, Hugh Lu and Xiao, Junyan and Mao, Jian and Zhang, Hong and Zhao, Yong and Choy, Wallace C. H.}, biburl = {https://www.bibsonomy.org/bibtex/212b4bf7bd29aa55145e90d48efee233c/cgoehler}, doi = {10.1002/adfm.201605469}, interhash = {a2c54be0c8ec3af0b053a0a0ffda8110}, intrahash = {12b4bf7bd29aa55145e90d48efee233c}, issn = {1616-3028}, journal = {Advanced Functional Materials}, keywords = {perovskite}, number = 11, pages = {n/a--n/a}, timestamp = {2017-03-16T11:01:03.000+0100}, title = {Controllable Crystallization of CH3NH3Sn0.25Pb0.75I3 Perovskites for Hysteresis-Free Solar Cells with Efficiency Reaching 15.2%}, url = {http://dx.doi.org/10.1002/adfm.201605469}, volume = 27, year = 2017 }