Distinct Exciton Dissociation Behavior of Organolead Trihalide Perovskite and Excitonic Semiconductors Studied in the Same System

Miao, Hu; Bi, Cheng; Yuan, Yongbo; Xiao, Zhengguo; Dong, Qingfeng; Shao, Yuchuan; Huang, Jinsong

doi:10.1002/smll.201402905

Cited by 78 publications

(57 citation statements)

References 36 publications

(20 reference statements)

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“…[ 26 ] The J SC enhancement by LISP is relatively small, though, because the exciton dissociates and charge collection effi ciency is not very sensitive to the built-in fi eld due to small exciton binding energy in MAPbI 3 and very long carrier diffusion length. [ 5,11 ] The transient dark current and voltage of the unidirectional device are included in Figure S2 (Supporting Information), showing the same phenomenon as that of the switchable devices.…”

Section: Wileyonlinelibrarycommentioning

confidence: 88%

Light‐Induced Self‐Poling Effect on Organometal Trihalide Perovskite Solar Cells for Increased Device Efficiency and Stability

Deng

Xiao

Huang

2015

Advanced Energy Materials

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that the photovoltage of the devices, which is generally above 0.33 V, is large enough to drive the drift of ions/vacancies in OTP devices with 300 nm thick MAPbI 3 . In this Communication, we show that the light-generated photovoltage also causes drift of ions/vacancies in the same way as the applied external bias, and the migration of ions increases the PCE of the working OTP solar cells under illumination.The device structure of the fi rst studied OTP solar cell is ITO/PEDOT:PSS/MAPbI 3 (300 nm)/Au (50 nm), as is shown in Figure 1 a, which has a switchable photovoltaic effect as demonstrated by us previously. [ 13 ] The as-prepared (pristine) device under 1 sun illumination (100 mW cm −2 ) shows poor performance with small short circuit current ( J SC ) of −10.5 mA cm −2 , open circuit voltage ( V OC ) of 0.24 V, and FF (fi ll factor) of 13.1% (Figure 1 b, blue line in region 4) because of the similar work function of PEDOT:PSS and Au. The photocurrents were scanned from 0 to 1 V at a high sweep rate of 0.31 V s −1 to minimize poling effect during the scanning process. [ 13 ] However, after illuminating the device at 1 sun (100 mW cm −2 ) for 2 min, an obvious PCE increase was observed, with the J SC , V OC , and FF enhanced to −20.3 mA cm −2 , 0.5 V, and 40.0%, respectively (red line). This enhancement is reversible if we store the device in dark condition for about 2 min, after which the performance goes back to the original level (purple line). Therefore this enhancement is not caused by poling effect during scanning but by illumination indeed. We have shown previously that the polarity of the device can be switched by scanning from −2.5 V to 0 V, after which the I -V curve was fl ipped to region 2. [ 13 ] Here we slightly poled the device so that the photocurrent direction was just switched, named as preswitched device (Figure 1 b, in region 2), while we limited the electric poling time so that the device's starting V OC was around −0.2 V to observe the light-induced poling effect (blue line in region 2). Consistently, we observed that illumination improved the performance of preswitched device as well (red line in region 2). The effect of light-induced photovoltaic performance change is thus termed as "Light-Induced Self-Poling (LISP)" effect. It demonstrates that the LISP process can be triggered on only if there is a preset V OC with a device nonsymmetry, and LISP increases the degree of the device nonsymmetry by increasing the band-bending.To determine the evolution of device performance change under illumination over time, we measured V OC change under 1 sun illumination for a relatively long duration, and the V OCillumination time plots for pristine and preswitched devices are shown in Figure 1 c. The V OC of initial pristine device was 0.12 V, but climbed rapidly up to 0.4 V in 15 s, and fi nally saturated at over 0.46 V with extended illumination time up to 100 s.Organolead trihalide perovskites (OTPs) are a family of organic-inorganic hybrid semiconductors that are promising for low-cost solar cel...

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Section: Wileyonlinelibrarycommentioning

confidence: 88%

Light‐Induced Self‐Poling Effect on Organometal Trihalide Perovskite Solar Cells for Increased Device Efficiency and Stability

Deng

Xiao

Huang

2015

Advanced Energy Materials

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223

220

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“…Interdiffusion method was applied to fabricate phase homogeneous, pin‐hole free MAPbBr x I 3– x thin films by the reaction of PbI 2 with MAI y :MABr 1– y mixed‐halide organic precursors. The bandgap was tuned by controlling the MABr percentage in the MAI y :MABr 1– y organic precursors 16, 17. The best PCE achieved with the interdiffusion formed MAPbBr 0.6 I 1.4 planar‐heterojunction structure solar cells was 13.1%, in which the hole transport layer was poly(3,4‐ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) 10.…”

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Stabilized Wide Bandgap MAPbBr_xI_3–x Perovskite by Enhanced Grain Size and Improved Crystallinity

et al. 2015

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“…In the EB measurement, the ionic dielectric response should be properly included. This response is found extremely large at the low frequency limit [15,16] and may effectively reduce EB down to the small predicted values [13,17]. This ionic response is also known as the reason for the hysteresis phenomenon in devices [18][19][20][21].…”

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Density-dependent dynamical coexistence of excitons and free carriers in the organolead perovskite CH3NH3PbI
Wang
¹
,
Liu
²
,
Wang
³

et al. 2016
Phys. Rev. B
28
0
10
0
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Distinct Exciton Dissociation Behavior of Organolead Trihalide Perovskite and Excitonic Semiconductors Studied in the Same System

Cited by 78 publications

References 36 publications

Light‐Induced Self‐Poling Effect on Organometal Trihalide Perovskite Solar Cells for Increased Device Efficiency and Stability

Light‐Induced Self‐Poling Effect on Organometal Trihalide Perovskite Solar Cells for Increased Device Efficiency and Stability

Stabilized Wide Bandgap MAPbBr_xI_3–x Perovskite by Enhanced Grain Size and Improved Crystallinity

Density-dependent dynamical coexistence of excitons and free carriers in the organolead perovskite CH3NH3PbI
Wang
¹
,
Liu
²
,
Wang
³

et al. 2016
Phys. Rev. B
28
0
10
0
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Distinct Exciton Dissociation Behavior of Organolead Trihalide Perovskite and Excitonic Semiconductors Studied in the Same System

Cited by 78 publications

References 36 publications

Light‐Induced Self‐Poling Effect on Organometal Trihalide Perovskite Solar Cells for Increased Device Efficiency and Stability

Light‐Induced Self‐Poling Effect on Organometal Trihalide Perovskite Solar Cells for Increased Device Efficiency and Stability

Stabilized Wide Bandgap MAPbBrxI3–x Perovskite by Enhanced Grain Size and Improved Crystallinity

Density-dependent dynamical coexistence of excitons and free carriers in the organolead perovskite CH3NH3PbIWang1, Liu2, Wang3 et al. 2016Phys. Rev. B280100View full textAdd to dashboardCite

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Stabilized Wide Bandgap MAPbBr_xI_3–x Perovskite by Enhanced Grain Size and Improved Crystallinity

Density-dependent dynamical coexistence of excitons and free carriers in the organolead perovskite CH3NH3PbI
Wang
¹
,
Liu
²
,
Wang
³

et al. 2016
Phys. Rev. B
28
0
10
0
View full text Add to dashboard Cite