Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 10, Issue 4, Pages 3602-3608Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b16912
Keywords
4-tert-butylpyridine; antisolvent; gradient structure; suppressed nucleation; perovskite solar cells
Funding
- National Basic Research Program of China [2016YFA0202400, 2015CB932200]
- National Natural Science Foundation of China [21403247]
- Distinguished Youth Foundation of Anhui Province [1708085J09]
- Major/Innovative Program of Development Foundation of the Hefei Center for Physical Science and Technology [2016FXZY003]
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The synthesis and growth of CH3NH3PbI3 films with controlled nucleation is a key issue for the high efficiency and stability of solar cells. Here, 4-tert-butylpyridine (tBP) was introduced into a CH3NH3PbI3 antisolvent to obtain high quality perovskite layers. In situ optical microscopy and X-ray diffraction patterns were used to prove that tBP significantly suppressed perovskite nucleation by forming an intermediate phase. In addition, a gradient perovskite structure was obtained by this method, which greatly improved the efficiency and stability of perovskites. An effective power conversion efficiency (PCE) of 17.41% was achieved via the tBP treatment, and the high-efficiency device could maintain over 89% of the initial PCE after 30 days at room temperature.
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