High‐Performance MAPbI₃/PM6:Y6 Perovskite/Organic Hybrid Photodetectors with a Broadband Response

Abstract

Broadband photodetectors have a wide range of applications in the fields of biomedical sensing, environmental monitoring, optical communications, and space exploration. Since light absorbed by MAPbX3 perovskite materials is mainly located within the visible light region, the detection range of perovskite photodetectors is limited. To broaden the detection range for these types of photodetectors and, thus, enhance the number of possible application scenarios, a non‐fullerene acceptor Y6 is introduced that strongly absorbs light in the near‐infrared band and alongside PM6 forms an organic bulk heterojunction. This results in the expansion of the absorption range due to the formation of a supplementary absorption layer onto the perovskite layer. In this paper, the effects of the newly introduced organic layer on the device performance are studied. Through the synergistic effects of the perovskite and the organic layer, a high‐performance self‐powered perovskite/organic hybrid broadband photodetector can be realized, which contains a wide detection range from ultraviolet and visible light to near‐infrared (300–1000 nm). After its optimization, the device exhibits a high external quantum efficiency value that is as high as 80% in the visible–near‐infrared band, a short response time in the region of 803/698 ns, and a large linear dynamic range of 143 dB.

Probing into Reverse Bias Dark Current in Perovskite Photodiodes: Critical Role of Surface Defects

“…The D* values are up to 10 12 Jones in the wavelength range of 350-750 nm at −0.1 V, with a peak D* of 1.46 × 10 12 Jones that is comparable to or better than the best reported perovskite photodiodes and even to commercial silicon photodiodes (Table S1, Supporting Information). [14,15,17,19,[48][49][50][51][52] Figure 4e shows the photoresponse transients of the passivated device, demonstrating the repeatable photoresponse with a fast rise of 1.03 µs and a rapid fall of 3.20 µs. Such high response/recovery speeds meet the rise/fall time requirements for imaging applications.…”

“…[7][8][9] An additional merit is that the optoelectronic properties of perovskites can be simply tuned by compositional and/or structural modifications. [10][11][12][13] Although great progress has been made in the photodetection performance of perovskite thin-film photodiodes, [14][15][16] vital challenges remain in improving their specific detectivity (D*), defined as the inverse of noise equivalent power (NEP) that is determined by the noise current (i noise ) and describes the photodetection limit. An important contribution to the noise current is the reverse bias dark current density (J dark ), which can span several orders of magnitude depending on the active material properties and the device structure.…”

Efficient organic self-powered photoelectrochemical photodetectors based on conjugated polymers/fullerene heterojunctions

“…17,18 Currently, OPDs exhibit a specific detectivity of 10 13 Jones, and the OPDs can also precisely respond in different ranges from ultraviolet (UV) to nearinfrared (NIR) with high responsivity. [18][19][20] PDs are mainly classified into photovoltaic and photoconductive PDs. Most OPDs employ a photovoltaic structure similar to organic solar cells, consisting of a substrate (FTO or ITO), a hole transport layer, a photoactive layer, an electron transport layer, and an evaporation electrode.…”

Facile Vertical Structure Broadband Photodetectors Enabled by Polyvinylpyrrolidone-Regulated Perovskite and Near-Infrared-Sensitive Lead Phthalocyanine

“…For instance, Jing et al investigated a single-crystalline perovskite ultrathin film-based perovskite photodetector under 514 nm visible light illumination; 18 Li's group reported a highperformance self-powered photodetector by integrating perovskites with gradient O-doped CdS nanorod arrays; 19 and Zhang and his co-authors employed a complex perovskite− organic hybrid structure with five layers to realize a broadband photoresponse. 20 However, there are some, but not many, photodetectors based on perovskite/organic semiconductor systems to achieve UV−Vis−NIR ultra-broadband photodetection, 21 especially rare for those of perovskite/small organic molecule systems. 22 To the best of our knowledge, perovskite/small organic molecule system-based photodetectors with a double-layer vertical structure and UV−Vis−NIR broadband response have not been reported.…”

“…Hereto, researchers have made a lot of progress in perovskite-based photodetectors, which mainly include three characteristics: UV–Vis photoresponse range, perovskite/inorganic photoactive system, and multilayer vertical device structures. For instance, Jing et al investigated a single-crystalline perovskite ultrathin film-based perovskite photodetector under 514 nm visible light illumination; Li’s group reported a high-performance self-powered photodetector by integrating perovskites with gradient O-doped CdS nanorod arrays; and Zhang and his co-authors employed a complex perovskite–organic hybrid structure with five layers to realize a broadband photoresponse . However, there are some, but not many, photodetectors based on perovskite/organic semiconductor systems to achieve UV–Vis–NIR ultra-broadband photodetection, especially rare for those of perovskite/small organic molecule systems .…”