Recent Progress on Photomultiplication Type Organic Photodetectors

Miao, Jianli; Zhang, Fujun

doi:10.1002/lpor.201800204

Cited by 212 publications

(197 citation statements)

References 221 publications

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“…The similar phenomenon on phase separation degree variation can also be observed from TEM images of the binary and the ternary blend films, as exhibited in Figure c. The dark and bright regions in TEM image are normally assigned as acceptor‐rich and donor‐rich domain, respectively . No obvious characteristics can be observed from the TEM image of PM6:T6Me blend films.…”

Section: Resultssupporting

confidence: 74%

Two Well‐Compatible Acceptors with Efficient Energy Transfer Enable Ternary Organic Photovoltaics Exhibiting a 13.36% Efficiency

Wang

Ming

et al. 2019

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Organic photovoltaics (OPVs) are fabricated with PM6 as donor and T6Me, IT‐2F, or their mixture as acceptor. A 13.36% power conversion efficiency (PCE) is achieved from the optimized ternary OPVs with 50 wt% IT‐2F in acceptors, which is attributed to the enhanced photon harvesting of ternary active layers and improved exciton utilization efficiency through energy transfer from IT‐2F to T6Me. The efficient energy transfer from IT‐2F to T6Me can be confirmed from the photoluminescence spectra of neat and blend films, which may provide additional channels to enhance exciton utilization efficiency for achieving short‐circuit current density (JSC) improvement of ternary OPVs. It should be highlighted that the fill factor (FF) of ternary OPVs can be monotonously increased along with the incorporation of IT‐2F, indicating the gradually optimized phase separation degree of ternary active layers. The third component IT‐2F plays a key role in optimizing phase separation as a morphology regulator. Over 8% PCE improvement is achieved in the optimized ternary OPVs compared with the over 12% PCEs of the corresponding binary OPVs, respectively. This work indicates that the performance of ternary OPVs can be well optimized by carefully picking materials with good compatibility and complementary absorption spectra, as well as the appropriate energy levels.

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Section: Resultssupporting

confidence: 74%

Two Well‐Compatible Acceptors with Efficient Energy Transfer Enable Ternary Organic Photovoltaics Exhibiting a 13.36% Efficiency

Wang

Ming

et al. 2019

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“…This high voltage responsivity thus gives an advantage over the photocurrent, especially at low light intensities. R v as a new figure of merit for photodetection is particularly important in wake of the recent studies on photomultiplication in thin film photodetectors where unusually high current responsivities >1000 A W −1 have been reported . Another advantage of the photovoltage responsivity lies in its independence from the detector surface area, which is a direct implication of Equation .…”

Section: Resultsmentioning

confidence: 99%

“…The extensive research on π‐conjugated materials over the last two decades has provided a better understanding of the light‐harvesting mechanisms in optoelectronic devices . Consequently, organic photodetectors (OPDs) show not only excellent quantum efficiency, and tunable spectral selectivity, but can also take advantage of photon up‐conversion, and photomultiplication mechanisms . Most importantly, organic semiconductor‐based sensors have closely approached the performance of conventional inorganic photodetectors demonstrating remarkable levels of responsivity, dark current, and even long‐term stability .…”

Section: Introductionmentioning

confidence: 99%

Light Detection in Open‐Circuit Voltage Mode of Organic Photodetectors

Kielar

Hamid

Wiemer

et al. 2019

Adv Funct Materials

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Organic photodetectors (OPDs) are promising candidates for next‐generation light sensors as they combine unique material properties with high‐level performance in converting photons into electrical signals. However, low‐level light detection with OPD is often limited by device dark current. Here, the open‐circuit voltage (Voc ) regime of OPDs is shown to be efficient for detecting low light signals (<100 µW cm−2). It is established that the light‐dependence of Voc exhibits two distinct regimes as function of irradiance: linear and logarithmic. Whereas the observed logarithmic regime is well understood in organic photovoltaic cells (OPVs), it is shown experimentally and theoretically that the linear regime is due to the non‐infinite shunt resistance of the OPD device. Overall, OPDs composed of rubrene and fullerene show photovoltage light sensitivity across nine orders of magnitude with a detection limit as low as 400 pW cm−2. A photovoltage responsivity of 1.75 V m2 W−1 demonstrates highly efficient performance without the necessity to supress high dark current. This approach opens up new possibilities for resolving low light signals and provides simplified design rules for OPDs.

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“…S1. The slope β reflects the bimolecular recombination degree . The β values are close to 1, suggesting that bimolecular recombination is weak.…”

Section: Resultsmentioning

confidence: 99%

Subtly adjusted active layer self‐assembly process for efficient organic solar cells

Wang

Sun

Xiao

et al. 2019

Polymer International

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The phase separation degree of active layers plays a vital role in enhancing the power conversion efficiency of organic solar cells. Two post treatments were employed to optimize the phase separation degree of active layers by subtly adjusting the self‐assembly process for SMPV1:PC71BM based active layers (SMPV1, 2,6‐bis[2,5‐bis(3‐octylrhodanine)‐(3,3‐dioctyl‐2,2':5,2''‐terthiophene)]‐4,8‐bis((5‐ethylhexyl)thiophen‐2‐yl)benzo[1,2‐b:4,5‐b']dithiophene; PC71BM, [6,6]‐phenyl‐C71‐butyric acid methyl ester). In this work, a power conversion efficiency of 7.93% was obtained for devices with an as‐cast active layer, which is close to the highest values reported for SMPV1 based devices. The power conversion efficiency was further increased to 8.64% or 8.99% for active layers with thermal annealing or thermal annealing together with solvent vapor annealing, respectively. The enhanced performance is mainly attributed to more efficient photon harvesting and charge transport induced by the post annealing treatment of the active layers. The face‐on molecular orientation of SMPV1 is increased for active layers with post annealing treatment, which is beneficial for charge transport along directions perpendicular to the substrate. This work further confirms the positive effect of post annealing treatment on the performance improvement of organic solar cells. © 2019 Society of Chemical Industry

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Recent Progress on Photomultiplication Type Organic Photodetectors

Cited by 212 publications

References 221 publications

Two Well‐Compatible Acceptors with Efficient Energy Transfer Enable Ternary Organic Photovoltaics Exhibiting a 13.36% Efficiency

Two Well‐Compatible Acceptors with Efficient Energy Transfer Enable Ternary Organic Photovoltaics Exhibiting a 13.36% Efficiency

Light Detection in Open‐Circuit Voltage Mode of Organic Photodetectors

Subtly adjusted active layer self‐assembly process for efficient organic solar cells

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