具有重量輕、成本低、易于集成的柔性鈣鈦礦太陽電池(F-PSCs)有希望補足傳統(tǒng)剛性硅太陽電池的應用領域，如建筑一體化光伏、可穿戴和便攜式電子設備等。然而，由于鈣鈦礦薄膜固有的脆性和由此引起的韌性斷裂所導致的機械穩(wěn)定性問題嚴重限制了F-PSC的光伏性能和壽命。因此，解決F-PSCs的機械穩(wěn)定性是其實現(xiàn)商業(yè)化的基礎。
近日，華南師范大學高進偉/姜月團隊通過將超分子PDMS聚氨酯(DSSP-PPU)組成的動態(tài)“韌帶”引入鈣鈦礦太陽電池的晶界，促進殘余應力的釋放和晶界的軟化。此外，這種動態(tài)“韌帶”表現(xiàn)出優(yōu)異的自愈合特性，能夠在室溫下愈合鈣鈦礦薄膜中的裂紋。所獲得的鈣鈦礦太陽電池對于剛性襯底和柔性襯底分別實現(xiàn)了23.73%和22.24%的功率轉(zhuǎn)換效率，對于柔性微型模塊也實現(xiàn)了17.32%的功率轉(zhuǎn)換效率。值得注意的是，在F-PSCs經(jīng)受8000次彎曲循環(huán)(r = 2 mm)后，F-PSCs仍保持其初始效率的近80%，并且通過室溫自愈合過程進一步恢復至初始效率的近90%。柔性和自愈合“韌帶”策略為提高 F-PSC 的耐用性和性能提供了一種簡單而有效的解決方案并促進F-PSC的商業(yè)應用。
Figure 1. a) Chemical structure of PDMS-PPU. b) Top-view (upper row) and cross-sectional (lower row) SEM images of perovskite films on SnO2/ITO with variable concentration of DSSP-PPU. Scale bars: 500 nm. c) XRD spectra of perovskite films with and without DSSP-PPU. d) HR-TEM of perovskite with DSSP-PPU, the right panels showing the enlarged regions of “1 and 2.” e) GIXRD with different instrumental ψ values (0°–50°) for perovskite with and without DSSP-PPU. f) Linear fit of 2θ-sin2ψ for perovskite with and without DSSP-PPU.
Figure 2. a) Chemical structure of PDMS-PPU. b) Top-view (upper row) and cross-sectional (lower row) SEM images of perovskite films on SnO2/ITO with variable concentration of DSSP-PPU. Scale bars: 500 nm. c) XRD spectra of perovskite films with and without DSSP-PPU. d) HR-TEM of perovskite with DSSP-PPU, the right panels showing the enlarged regions of “1 and 2.” e) GIXRD with different instrumental ψ values (0°–50°) for perovskite with and without DSSP-PPU. f) Linear fit of 2θ-sin2ψ for perovskite with and without DSSP-PPU.
Figure 3. a) Chemical structure of PDMS-PPU. b) Top-view (upper row) and cross-sectional (lower row) SEM images of perovskite films on SnO2/ITO with variable concentration of DSSP-PPU. Scale bars: 500 nm. c) XRD spectra of perovskite films with and without DSSP-PPU. d) HR-TEM of perovskite with DSSP-PPU, the right panels showing the enlarged regions of “1 and 2.” e) GIXRD with different instrumental ψ values (0°–50°) for perovskite with and without DSSP-PPU. f) Linear fit of 2θ-sin2ψ for perovskite with and without DSSP-PPU.
Figure 4. a) Chemical structure of PDMS-PPU. b) Top-view (upper row) and cross-sectional (lower row) SEM images of perovskite films on SnO2/ITO with variable concentration of DSSP-PPU. Scale bars: 500 nm. c) XRD spectra of perovskite films with and without DSSP-PPU. d) HR-TEM of perovskite with DSSP-PPU, the right panels showing the enlarged regions of “1 and 2.” e) GIXRD with different instrumental ψ values (0°–50°) for perovskite with and without DSSP-PPU. f) Linear fit of 2θ-sin2ψ for perovskite with and without DSSP-PPU.
Figure 5. a) Chemical structure of PDMS-PPU. b) Top-view (upper row) and cross-sectional (lower row) SEM images of perovskite films on SnO2/ITO with variable concentration of DSSP-PPU. Scale bars: 500 nm. c) XRD spectra of perovskite films with and without DSSP-PPU. d) HR-TEM of perovskite with DSSP-PPU, the right panels showing the enlarged regions of “1 and 2.” e) GIXRD with different instrumental ψ values (0°–50°) for perovskite with and without DSSP-PPU. f) Linear fit of 2θ-sin2ψ for perovskite with and without DSSP-PPU.
華南師范大學姜月副研究員和高進偉教授為論文的通訊作者，華南師范大學博士研究生楊正池為論文第一作者。感謝國家自然科學基金（No. 62105124，）廣東省基礎與應用基礎研究基金（No. 2022B1515120006, 2022A1515010264）等對本文的資助。相關成果以" Supramolecular polyurethane "Ligaments" Enabling Room-Temperature Self-Healing Flexible Perovskite Solar Cells and Mini-modules"為題發(fā)表在期刊《Small》上。
原文鏈接: https://doi.org/10.1002/smll.202307186
