%0 Journal Article %1 doi:10.1021/acs.jpclett.7b00353 %A Zhang, Chuang %A Sun, Dali %A Liu, Xiaojie %A Sheng, Chuan-Xiang %A Vardeny, Zeev Valy %D 2017 %J The Journal of Physical Chemistry Letters %K hysteresis perovskite %N 7 %P 1429-1435 %R 10.1021/acs.jpclett.7b00353 %T Temperature-Dependent Electric Field Poling Effects in CH3NH3PbI3 Optoelectronic Devices %U http://dx.doi.org/10.1021/acs.jpclett.7b00353 %V 8 %X Organo-lead halide perovskites show excellent optoelectronic properties; however, the unexpected inconsistency in forward–backward I–V characteristics remains a problem for fabricating solar panels. Here we have investigated the reasons behind this “hysteresis” by following the changes in photocurrent and photoluminescence under electric field poling in transverse CH3NH3PbI3-based devices from 300 to 10 K. We found that the hysteresis disappears at cryogenic temperatures, indicating the “freeze-out” of the ionic diffusion contribution. When the same device is cooled under continuous poling, the built-in electric field from ion accumulation brings significant photovoltaic effect even at 10 K. From the change of photoluminescence upon polling, we found a second dipole-related mechanism which enhances radiative recombination upon the alignment of the organic cations. The ionic origin of hysteresis was also verified by applying a magnetic field to affect the ion diffusion. These findings reveal the coexistence of ionic and dipole-related mechanisms for the hysteresis in hybrid perovskites.

@article{doi:10.1021/acs.jpclett.7b00353, abstract = { Organo-lead halide perovskites show excellent optoelectronic properties; however, the unexpected inconsistency in forward–backward I–V characteristics remains a problem for fabricating solar panels. Here we have investigated the reasons behind this “hysteresis” by following the changes in photocurrent and photoluminescence under electric field poling in transverse CH3NH3PbI3-based devices from 300 to 10 K. We found that the hysteresis disappears at cryogenic temperatures, indicating the “freeze-out” of the ionic diffusion contribution. When the same device is cooled under continuous poling, the built-in electric field from ion accumulation brings significant photovoltaic effect even at 10 K. From the change of photoluminescence upon polling, we found a second dipole-related mechanism which enhances radiative recombination upon the alignment of the organic cations. The ionic origin of hysteresis was also verified by applying a magnetic field to affect the ion diffusion. These findings reveal the coexistence of ionic and dipole-related mechanisms for the hysteresis in hybrid perovskites. }, added-at = {2017-07-24T14:36:25.000+0200}, author = {Zhang, Chuang and Sun, Dali and Liu, Xiaojie and Sheng, Chuan-Xiang and Vardeny, Zeev Valy}, biburl = {https://www.bibsonomy.org/bibtex/20e7646472e13b37f8eb7a8120e3151a2/woepps}, doi = {10.1021/acs.jpclett.7b00353}, eprint = {http://dx.doi.org/10.1021/acs.jpclett.7b00353}, interhash = {70721a4223b37841f0d5a5e9f525a19c}, intrahash = {0e7646472e13b37f8eb7a8120e3151a2}, journal = {The Journal of Physical Chemistry Letters}, keywords = {hysteresis perovskite}, note = {PMID: 28299942}, number = 7, pages = {1429-1435}, timestamp = {2017-07-24T14:36:25.000+0200}, title = {Temperature-Dependent Electric Field Poling Effects in CH3NH3PbI3 Optoelectronic Devices}, url = {http://dx.doi.org/10.1021/acs.jpclett.7b00353}, volume = 8, year = 2017 }