Efficient lead acetate sourced planar heterojunction perovskite solar cells with enhanced substrate coverage via one-step spin-coating

Liu, Cong; Guo, Qiang; Qiao, Wenming; Chen, Qi; Ma, Shuang; Pan, Xu; Wang, Fuzhi; Yao, Jianxi; Zhang, Chunfeng; Xiao, Min; Dai, Songyuan; Tan, Zhan’ao

doi:10.1016/j.orgel.2016.03.017

Cited by 49 publications

(35 citation statements)

References 40 publications

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“…[21][22][23][24][25][26][27] The second recipe is based on the solvent engineering technique introduced by Jeon et al in 2014. The first recipe is based on a lead acetate trihydrate (PbAc 2 ·3H 2 O) precursor and has attracted significant attention for application in inverted architecture solar cells since its introduction by Zhang and co-workers.…”

Section: Photovoltaic Performancementioning

confidence: 99%

Role of Microstructure in Oxygen Induced Photodegradation of Methylammonium Lead Triiodide Perovskite Films

Sun

Faßl

Becker‐Koch

et al. 2017

Advanced Energy Materials

213

210

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photovoltaic technology, where lifetimes greater than 25 years are required. [2] Although the issue of device stability has attracted increased attention of the photovoltaic research community in the last two years, reports that systematically study the fundamental causes (e.g., heat, electrical stress, humidity, oxygen, (UV) light, chemical precursors, processing conditions, influence of film quality and morphology) and mechanisms limiting the material and device stability remain scarce. [2][3][4][5] While the degradation of methylammonium lead iodide (MAPbI 3 ) in humid air has been studied experimentally as well as theoretically and was long thought to be the main factor for material degradation in ambient environment, [6][7][8][9][10][11][12][13][14][15] studies exploring the influence of oxygen and light on the solar cell performance have only recently been reported. [16][17][18][19][20] It has been shown that photoexcited electrons in the perovskite layer can form superoxide (O 2 − ) via electron transfer to molecular oxygen, which through deprotonation of the methylammonium cation in turn results in irreversible material degradation. The severity of the degradation has been linked to the efficiency of electron extraction via the electron extracting layer (EEL): devices employing a compact-TiO 2 /mesoporous Al 2 O 3 or compact-TiO 2 as EELs degraded in dry air on a timescale of less than 1 h, while with the use of a mesoporous TiO 2 layer, an EEL which results in faster electron extraction, the lifetimes were significantly increased. However, in these reports only the degradation of complete photovoltaic device was reported, with limited information on the degradation of the perovskite active layer itself and the impact of its microstructure was not identified.In this work, we systematically study the degradation of MAPbI 3 films under precisely controlled exposure to various oxygen levels (0-20%) under simulated sunlight in order to shed light on the progression of perovskite degradation under these conditions. We investigate two types of perovskite layers that are formed using different fabrication methods. The two recipes allow us to include the effect of layer microstructure on the dynamics of oxygen-induced degradation. We characterize the electronic, optical, compositional, and structural properties of the degraded perovskite films and correlate these results This paper investigates the impact of microstructure on the degradation rate of methylammonium lead triiodide (MAPbI 3 ) perovskite films upon exposure to light and oxygen. By comparing the oxygen induced degradation of perovskite films of different microstructure-fabricated using either a lead acetate trihydrate precursor or a solvent engineering technique-it is demonstrated that films with larger and more uniform grains and better electronic quality show a significantly reduced degradation compared to films with smaller, more irregular grains. The effect of degradation on the optical, compositional, and microstructural properties of the perovsk...

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Section: Photovoltaic Performancementioning

confidence: 99%

Role of Microstructure in Oxygen Induced Photodegradation of Methylammonium Lead Triiodide Perovskite Films

Sun

Faßl

Becker‐Koch

et al. 2017

Advanced Energy Materials

213

210

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“…Passivation treatment by introducing a functional anion can adjust the growth of the perovskite crystal and effectively passivate the defects of perovskite films, such as F − , SCN − , and so on. Recently, some studies have reported that the addition of Ac − anions can enhance the device efficiency significantly which will adjust the growth of perovskite crystals and control surface morphology to obtain uniform, dense, high‐quality perovskite films . Currently, Zeng et al realized a stable and photoactive α‐phase CsPbI 2 Br by doping Pb(Ac) 2 at low temperature.…”

Section: Introductionmentioning

confidence: 99%

Europium and Acetate Co‐doping Strategy for Developing Stable and Efficient CsPbI₂Br Perovskite Solar Cells

Yang

Zhao

Han

et al. 2019

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All‐inorganic perovskite solar cells have developed rapidly in the last two years due to their excellent thermal and light stability. However, low efficiency and moisture instability limit their future commercial application. The mixed‐halide inorganic CsPbI2Br perovskite with a suitable bandgap offers a good balance between phase stability and light harvesting. However, high defect density and low carrier lifetime in CsPbI2Br perovskites limit the open‐circuit voltage (Voc < 1.2 V), short‐circuit current density (Jsc < 15 mA cm−2), and fill factor (FF < 75%) of CsPbI2Br perovskite solar cells, resulting in an efficiency below 14%. For the first time, a CsPbI2Br perovskite is doped by Eu(Ac)3 to obtain a high‐quality inorganic perovskite film with a low defect density and long carrier lifetime. A high efficiency of 15.25% (average efficiency of 14.88%), a respectable Voc of 1.25 V, a reasonable Jsc of 15.44 mA cm−2, and a high FF of 79.00% are realized for CsPbI2Br solar cells. Moreover, the CsPbI2Br solar cells with Eu(Ac)3 doping demonstrate excellent air stability and maintain more than 80% of their initial power conversion efficiency (PCE) values after aging in air (relative humidity: 35–40%) for 30 days.

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“…We find that the device efficiency is relatively improved for about 10% and the device stability is greatly enhanced as well. Although PbAc 2 has been used as a lead source to fabricate pin‐hole free and ultra‐smooth perovskite films, the utilization of it as an additive for enhancing the crystallization of perovskite films has never been reported before. Therefore, this work provides a novel and cost‐effective approach to improving the performance of PSCs.…”

mentioning

confidence: 99%

Performance Enhancement of Perovskite Solar Cells Induced by Lead Acetate as an Additive

et al. 2018

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The crystallinity of organic–inorganic hybrid lead halide perovskite active layers is critical to the performance of perovskite solar cells (PSCs). However, it is a challenge to control the crystallization process of perovskite films by solution process. Here, the fabrication of high‐efficiency PSCs by employing lead acetate (PbAc2) as an additive in the perovskite precursor is demonstrated for the first time. By adding a few percent of PbAc2 (molar ratio with respect to PbI2) into the precursors, the perovskite crystallization process is significantly retarded, leading to pinhole‐free perovskite films with large grains and low defect densities. As result, the power conversion efficiencies and stability of the PSCs are substantially improved. This work provides a convenient and unique approach for preparing high‐quality perovskite films that can be used in photovoltaics as well as other optoelectronic devices.

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Efficient lead acetate sourced planar heterojunction perovskite solar cells with enhanced substrate coverage via one-step spin-coating

Cited by 49 publications

References 40 publications

Role of Microstructure in Oxygen Induced Photodegradation of Methylammonium Lead Triiodide Perovskite Films

Role of Microstructure in Oxygen Induced Photodegradation of Methylammonium Lead Triiodide Perovskite Films

Europium and Acetate Co‐doping Strategy for Developing Stable and Efficient CsPbI₂Br Perovskite Solar Cells

Performance Enhancement of Perovskite Solar Cells Induced by Lead Acetate as an Additive

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Efficient lead acetate sourced planar heterojunction perovskite solar cells with enhanced substrate coverage via one-step spin-coating

Cited by 49 publications

References 40 publications

Role of Microstructure in Oxygen Induced Photodegradation of Methylammonium Lead Triiodide Perovskite Films

Role of Microstructure in Oxygen Induced Photodegradation of Methylammonium Lead Triiodide Perovskite Films

Europium and Acetate Co‐doping Strategy for Developing Stable and Efficient CsPbI2Br Perovskite Solar Cells

Performance Enhancement of Perovskite Solar Cells Induced by Lead Acetate as an Additive

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Europium and Acetate Co‐doping Strategy for Developing Stable and Efficient CsPbI₂Br Perovskite Solar Cells