Efficient and Stable Methylammonium-Free Tin-Lead Perovskite Solar Cells with Hexaazatrinaphthylene-Based Hole-Transporting Materials

Guo, Huanxin; Zhang, Huidong; Liu, Shuaijun; Zhang, Diwei; Wu, Yongzhen; Zhu, Weihong

doi:10.1021/acsami.1c22659

Cited by 15 publications

(20 citation statements)

References 36 publications

(62 reference statements)

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Section: Interface Engineeringmentioning

confidence: 99%

“…Very recently, hexaazatrinaphthylene (HATNA) derivatives (TPA‐HATNA and MeOTPA‐HATNA) were employed as HTMs for Sn–Pb Perovskite solar cells. [ 138 ] The addition of a donor moiety to the HATNA core enhances solvent machinability in organic solvents while upshifting the HOMO energy levels. The HATNA derivative's increased surface wettability and coordination aided in the formation of homogeneous and compact Sn–Pb films, as a result p‐i‐n structured devices of FA 0.8 Cs 0.2 Pb 0.6 Sn 0.4 I 3 absorber layer delivered a PCE of 18.05% (certified 16.39%).…”

Section: Interface Engineeringmentioning

confidence: 99%

“…Reproduced with permission. [ 138 ] Copyright 2022, American Chemical Society. h) MPPT tracking of FA 0.7 Cs 0.3 Sn 0.3 Pb 0.7 I 3 based device processed with SnCl 2 ,3FACl additive under continuous illumination.…”

Section: Strategies For Stability Improvementmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Methylammonium and Bromide‐Free Tin‐Based Low Bandgap Perovskite Solar Cells

Imran

Rauf

Raza

et al. 2022

Advanced Energy Materials

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its volatility and reversible/irreversible decomposition reaction even at low temperature, MA is gradually avoided in the material designs. [9] At the same time, FA is more thermally stable than MA due to its stronger hydrogen bonding with PbX 6 octahedra and benign reversible decomposition reaction below 85 °C, and it is the primary cation in practically all current high-performance PSCs. [10,11] Also, FA has no irreversible (nonselective) back reaction. [12] At the same time, in order to approach the bandgap of 1.34 eV according to the Schottky-Queisser (S-Q) limit, from initially MAPbI 3 to double cation (MAFA or FACs), [10,13,14] triple cation (CsMAFA) based perovskites, [5] eventually to quadruple (CsRbMAFA) based perovskites, [4,[15][16][17] and recently FAPbI 3 are dominated ones. [18][19][20] FAPbI 3 has an ideal, narrow bandgap since FA remains the largest organic cation that fits into a 3D perovskite crystal structure. [21] The implicit or explicit goal of perovskite research is to obtain a black FA-based (stable phase) perovskite at room temperature. Avoiding yellow phase impurities encouraged the advancement of processing techniques and elaborate multication, multi-halide mixtures.It has been proved that the invasion of Br anion at the X site is effective for stabilizing the black phase FA-based and other perovskites. But it leads to an adverse blue-shift of the bandgap disproportionately. For example, there is a spanning of 700 meV persisting in MAPbI x Br 1-x from 2.28 eV (MAPbBr 3 ) to 1.58 eV (MAPbI 3 ). [22] Furthermore, from a stability perspective, introducing Br anion in iodide-based perovskites is unfavorable since Br/I mixtures will undergo severe anion segregation Lead halide-based perovskite solar cells (PSCs) are intriguing candidates for photovoltaic technology because of their high efficiency, low cost, and simple process advantages. Owing to lead toxicity, PSCs based on partially/fully substituted Pb with tin have attracted tremendous attention, which would enable the ideal bandgap to approach the Shockley-Queisser (S-Q) limit. Especially, methylammonium (MA), bromide-free, tin-based perovskites are striking, because of the intrinsic poor stability of MA and blue shift caused by the incorporation of Br − . The first section of this review emphasizes the motivation for studying single-junction MA, Br-free, and Sn-based perovskites. The film quality improvement strategies of Sn-based perovskites, including additive, composition, dimensional, and interface engineering toward high-efficiency devices are comprehensively overviewed. Moreover, strategies to improve stability, where shelf, thermal and operational stabilities of the devices are summarized. Finally, this review concludes with a discussion of actual limitations and future prospects for Sn-based PSCs.

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Section: Interface Engineeringmentioning

confidence: 99%

Section: Interface Engineeringmentioning

confidence: 99%

Section: Strategies For Stability Improvementmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Methylammonium and Bromide‐Free Tin‐Based Low Bandgap Perovskite Solar Cells

Imran

Rauf

Raza

et al. 2022

Advanced Energy Materials

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Molecular Configuration Engineering in Hole‐Transporting Materials toward Efficient and Stable Perovskite Solar Cells

Tang

Liu

et al. 2022

Adv Funct Materials

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The development of hole-transporting materials (HTMs) that can passivate defects in perovskite is of great significance in improving the efficiency and long-term stability of perovskite solar cells. To date, the investigation on HTMs mainly focus on exploring new structures, while molecular configuration is seldomly concerned. In this work, two small molecules are developed as HTMs with benzil and phenanthrene quinone as the core structure, respectively. With similar structure and the same defect passivation groups, whereas, the two molecules exhibit different configurations, thus distinct properties. Compared to 3,6-bis(3,6-bis(bis(4-methoxyphenyl)amino)-9H-carbazol-9-yl) phenanthrene-9,10-dione (PQ) with a rigid core structure, the benzil group in 1,2-bis(4-(3,6-bis(bis(4-methoxyphenyl)amino)-9H-carbazol-9-yl)phenyl)ethane-1,2-dione (DB) is flexible and can adjust molecular configuration to efficiently interact with the underlying perovskite material, which is confirmed from both experimental results and theoretical simulations. The DB-based device exhibits a high power conversion efficiency of 22.21% with excellent long-term stability, superior to the PQ-based device (20.22%). This study demonstrates that molecular configuration engineering will directly affect the properties of hole transport materials, as well as their interactions with perovskite, which should also be taken into consideration when devising HTMs.

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Dopant‐Free Pyrrolopyrrole‐Based (PPr) Polymeric Hole‐Transporting Materials for Efficient Tin‐Based Perovskite Solar Cells with Stability Over 6000 h

et al. 2023

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A new set of pyrrolopyrrole‐based (PPr) polymers incorporated with thioalkylated/alkylated bithiophene (SBT/BT) is synthesized and explored as hole‐transporting materials (HTMs) for Sn‐based perovskite solar cells (TPSCs). Three bithiophenyl spacers bearing the thioalkylated hexyl (SBT‐6), thioalkylated tetradecyl (SBT‐14), and tetradecyl (BT‐14) chains are utilized to examine the effect of the alkyl chain lengths. Among them, the TPSCs are fabricated using PPr‐SBT‐14 as HTMs through a two‐step approach by attaining a power conversion efficiency (PCE) of 7.6% with a remarkable long‐term stability beyond 6000 h, which has not been reported elsewhere for a non‐PEDOT:PSS‐based TPSC. The PPr‐SBT‐14 device is stable under light irradiation for 5 h in air (50% relative humidity) at the maximum power point (MPP). The highly planar structure, strong intramolecular S(alkyl)···S(thiophene) interactions, and extended π‐conjugation of SBT enable the PPr‐SBT‐14 device to outperform the standard poly(3‐hexylthiophene,‐2,5‐diyl (P3HT) and other devices. The longer thio‐tetradecyl chain in SBT‐14 restricts molecular rotation and strongly affects the molecular conformation, solubility, and film wettability over other polymers. Thus, the present study makes a promising dopant‐free polymeric HTM model for the future design of highly efficient and stable TPSCs.

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Efficient and Stable Methylammonium-Free Tin-Lead Perovskite Solar Cells with Hexaazatrinaphthylene-Based Hole-Transporting Materials

Cited by 15 publications

References 36 publications

Methylammonium and Bromide‐Free Tin‐Based Low Bandgap Perovskite Solar Cells

Methylammonium and Bromide‐Free Tin‐Based Low Bandgap Perovskite Solar Cells

Molecular Configuration Engineering in Hole‐Transporting Materials toward Efficient and Stable Perovskite Solar Cells

Dopant‐Free Pyrrolopyrrole‐Based (PPr) Polymeric Hole‐Transporting Materials for Efficient Tin‐Based Perovskite Solar Cells with Stability Over 6000 h

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