Boosting the performance of planar heterojunction perovskite solar cell by controlling the precursor purity of perovskite materials

Chang, Jingjing; Zhu, Hai; Li, Bichen; Isikgor, Furkan H.; Hao, Yue; Xu, Qing‐Hua; Ouyang, Jianyong

doi:10.1039/c5ta08398b

Cited by 145 publications

(100 citation statements)

References 45 publications

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“…Because of the proper alignment of the energy level, the NIR light–induced holes could be extracted by MAPbI 3 when direct contact between MAPbI 3 and OBHJ can be formed. Furthermore, the hole mobility of the MAPbI 3 perovskite is higher than that of PTB7‐Th . That is to say, MAPbI 3 can act as good hole transport material to extract the NIR light–induced free holes more efficiently, which leads to the improvement of EQE in NIR region.…”

Section: Resultsmentioning

confidence: 98%

Perovskite/Organic Bulk‐Heterojunction Integrated Ultrasensitive Broadband Photodetectors with High Near‐Infrared External Quantum Efficiency over 70%

Chen

et al. 2018

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Ultraviolet-visible-near infrared (UV-Vis-NIR) broadband detection is important for image sensing, communication, and environmental monitoring, yet remains as a challenge in achieving high external quantum efficiency (EQE) in the broad spectrum range. Herein, sensitive broadband integrated photodetectors (PDs) with high EQE levels are reported. The organic bulk-heterojunction (OBHJ) layer, based on a NIR sensitive organic acceptor, is employed to extend the response spectrum of the perovskite PDs. A key strategy of introducing dual electron transport materials respectively for Vis and NIR regions into the active layer of integrated PDs is applied. Further combined with the proper energy level alignment and reasonable distribution of PC BM in the active layer, the extraction and transport of photo induced charges in between perovskite and OBHJ is promoted efficiently. The integrated PD with the optimized structure exhibits an EQE mostly beyond 70% in the Vis-NIR region, which is the highest value among the ever reported solution-processable broadband PDs. The highest responsivity is 0.444 and 0.518 A W in the Vis and NIR region, respectively. The specific detectivity is beyond 10 Jones in the range from 340 to 940 nm, enabling the device to detect weak signals in the UV to NIR broad region.

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Section: Resultsmentioning

confidence: 98%

Perovskite/Organic Bulk‐Heterojunction Integrated Ultrasensitive Broadband Photodetectors with High Near‐Infrared External Quantum Efficiency over 70%

Chen

et al. 2018

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“…It is suggested that many film preparation details could result in film quality tuning, which will result in different charge diffusion coefficients and lifetimes of the perovskite films. The important variables could be: (1) the source materials' purity [68], (2) the deviation from the ideal stoichiometric ratio [69][70][71][72], (3) the film morphology associated with preparation methods [73][74][75], and (4) the possible presence of new interphase during post annealing of perovskite films [48,76]. Recently, the best-in-class PVSCs based on >300 nm thick MAPbI 3 films [22,48] have shown ~90% IPCEs, meaning negligible charge collection losses and long effective diffusion lengths at least over 300 nm.…”

Section: Charge Transportmentioning

confidence: 99%

The rising star in photovoltaics-perovskite solar cells: The past, present and future

Fang

Zhang

et al. 2016

Sci. China Technol. Sci.

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Perovskite solar cell (PVSC), after its invention since 2009, has attracted tremendous attention from both academia and industry, because of its low cost, ease of manufacturing features and the sky-rocketing efficiencies being achieved within such a short period of time. Currently, the new efficiency record has reached 21.0%, comparable to that of the commercialized PV technologies developed for decades, such as multi-crystalline Si, CIGS and CdTe thin film solar cells. It is very possible that PVSCs would one day step over the threshold of marketization, share or even overturn the current PV market dominated by crystalline-Si solar cells. However, there are still several obstacles to be overcome on the road towards PVSC industrialization. This paper has reviewed the brief developing history and the current research status of PVSCs, and explained: Why PVSCs are so important in the next-generation solar cells, why organometal halide perovskites work so well as light absorbers, and what the inherent differences are among different cell configurations. The prospects on how to realize scale-up industrialization of PVSCs have also been given in the sequence of efficiency, stability, cost, toxicity, and short-term objectives. Resolutions to the remaining challenges according to their orders of technical difficulty and importance have also been discussed. organometal halides, perovskite solar cells, cell configurations, efficiency records, stability, industrialization prospects Citation:Fang R, Zhang W J, Zhang S S, et al. The rising star in photovoltaics-perovskite solar cells: The past, present and future.

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“…[31] Thus, ac ost-effective way to purify the precursor for the perovskite solar cell is essential. [31] Thus, ac ost-effective way to purify the precursor for the perovskite solar cell is essential.…”

Section: Resultsmentioning

confidence: 99%

CH₃NH₃PbI₃ and HC(NH₂)₂PbI₃ Powders Synthesized from Low‐Grade PbI₂: Single Precursor for High‐Efficiency Perovskite Solar Cells

et al. 2018

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High-efficiency perovskite solar cells are generally fabricated by using highly pure (>99.99 %) PbI mixed with an organic iodide in polar aprotic solvents. However, the use of such an expensive chemical may impede progress toward large-scale industrial applications. Here, we report on the synthesis of perovskite powders by using inexpensive low-grade (99 %) PbI and on the photovoltaic performance of perovskite solar cells prepared from a powder-based single precursor. Pure APbI [A=methylammonium (MA) or formamidinium (FA)] perovskite powders were synthesized by treating low-grade PbI with MAI or FAI in acetonitrile at ambient temperature. The structural phase purity was confirmed by X-ray diffraction. The solar cell with a MAPbI film prepared from the synthesized perovskite powder demonstrated a power conversion efficiency (PCE) of 17.14 %, which is higher than the PCE of MAPbI films prepared by using both MAI and PbI as precursors (PCE=13.09 % for 99 % pure PbI and PCE=16.39 % for 99.9985 % pure PbI ). The synthesized powder showed better absorption and photoluminescence, which were responsible for the better photovoltaic performance. For the FAPbI powder, a solution with a yellow non-perovskite δ-FAPbI powder synthesized at room temperature was found to lead to a black perovskite film, whereas a solution with the black perovskite α-FAPbI powder synthesized at 150 °C was not transformed into a black perovskite film. The α↔δ transition between the powder and film was assumed to correlate with the difference in the iodoplumbates in the powder-dissolved solution. An average PCE of 17.21 % along with a smaller hysteresis [ΔPCE=PCE -PCE )=1.53 %] was demonstrated from the perovskite solar cell prepared by using δ-FAPbI powder; this PCE is higher than the average PCE of 17.05 % with a larger hysteresis (ΔPCE=2.71 %) for a device based on a conventional precursor solution dissolving MAI with high-purity PbI . The smaller hysteresis was indicative of fewer defects in the resulting FAPbI film prepared by using the δ-FAPbI powder.

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Boosting the performance of planar heterojunction perovskite solar cell by controlling the precursor purity of perovskite materials

Abstract: Perovskite solar cells using highly pure PbI2exhibit an efficiency higher than that with low purity PbI2by 30–40%.

Cited by 145 publications

References 45 publications

Perovskite/Organic Bulk‐Heterojunction Integrated Ultrasensitive Broadband Photodetectors with High Near‐Infrared External Quantum Efficiency over 70%

Perovskite/Organic Bulk‐Heterojunction Integrated Ultrasensitive Broadband Photodetectors with High Near‐Infrared External Quantum Efficiency over 70%

The rising star in photovoltaics-perovskite solar cells: The past, present and future

CH₃NH₃PbI₃ and HC(NH₂)₂PbI₃ Powders Synthesized from Low‐Grade PbI₂: Single Precursor for High‐Efficiency Perovskite Solar Cells

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Boosting the performance of planar heterojunction perovskite solar cell by controlling the precursor purity of perovskite materials

Abstract: Perovskite solar cells using highly pure PbI2exhibit an efficiency higher than that with low purity PbI2by 30–40%.

Cited by 145 publications

References 45 publications

Perovskite/Organic Bulk‐Heterojunction Integrated Ultrasensitive Broadband Photodetectors with High Near‐Infrared External Quantum Efficiency over 70%

Perovskite/Organic Bulk‐Heterojunction Integrated Ultrasensitive Broadband Photodetectors with High Near‐Infrared External Quantum Efficiency over 70%

The rising star in photovoltaics-perovskite solar cells: The past, present and future

CH3NH3PbI3 and HC(NH2)2PbI3 Powders Synthesized from Low‐Grade PbI2: Single Precursor for High‐Efficiency Perovskite Solar Cells

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CH₃NH₃PbI₃ and HC(NH₂)₂PbI₃ Powders Synthesized from Low‐Grade PbI₂: Single Precursor for High‐Efficiency Perovskite Solar Cells